/seuh nah"teuh/, n. Music.
a composition for one or two instruments, typically in three or four movements in contrasted forms and keys.
[1685-95; < It < L sonata, fem. of sonatus (ptp. of sonare to SOUND1). See SONANT, -ATE1]

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Musical form for one or more instruments, usually consisting of three or four movements.

The name, Italian for "sounded (on an instrument)," originally simply indicated nonvocal music and was used for a confusing variety of genres into the late 17th century. In the 1650s two types of ensemble sonatas began to be codified, the sonata da chiesa (church sonata) and sonata da camera (chamber sonata). The former, intended for church performance, was generally in four movements, two of them slow; the latter was usually a suite of dances. The so-called solo sonata (for soloist
usually violin
and continuo) and the trio sonata (for two soloists and continuo) became standard. In the 1740s solo keyboard sonatas began to be written. C.P.E. Bach established the three-movement keyboard sonata as the norm, a status it would retain through the classical era. Duo sonatas in the same form, usually for violin and keyboard, simultaneously became highly popular. Keyboard and duo sonatas have remained the standard types to the present day. From Bach's time onward, the first movement was generally in allegro tempo and in sonata form. The second movement was usually slow. The last movement was generally a minuet, rondo, or theme and variations. In a four-movement sonata, the third was usually a minuet or scherzo. In these respects the sonata paralleled genres such as the symphony and the string quartet.
(as used in expressions)
sonata allegro form

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      form of musical composition based on exposition, development, and recapitulation. As explained below, however, the term is also used in other senses.

      Deriving from the past participle of the Italian verb sonare, “to sound,” the term sonata originally denoted a composition played on instruments, as opposed to one that was cantata, or “sung,” by voices. Its first such use was in 1561, when it was applied to a suite of dances for lute. The term has since acquired other meanings that can easily cause confusion. It can mean a composition in two or more movements, or separate sections, played by a small group of instruments, having no more than three independent parts. Most frequently it refers to such a piece for one or two instruments. By extension, sonata can also refer to a composition for a larger instrumental group having more than two or three parts, such as a string quartet or an orchestra, provided that the composition is based on principles of musical form that from the mid-18th century were used in sonatas for small instrumental groups. The term has been more loosely applied to 20th-century works, whether or not they rely on 18th-century principles.

      Quite distinct from all of the preceding, however, is the use of the term in “sonata form.” This denotes a particular form or method of musical organization normally used within instrumental sonatas, string quartets, and other chamber music, and symphonies written since the beginning of the Classical period (the period of Mozart, Haydn, and Beethoven) in the mid-18th century.

      The first concern of this article will be to establish the principles of musical form often associated with sonatas for small and large groups of instruments. They will be approached through an examination of the principle of musical structure called “sonata form.” A historical account of the origins and development both of the instrumental sonata and of sonata form will then endeavour to throw light on other meanings of the term. In conclusion, some estimate will be offered of the present and possible future roles of the sonata in musical life.

Structure of the Classical sonata
      Sonata form denotes a particularly fertile manner of organizing the musical structure of a single movement. It commonly occurs within the larger context of a multimovement scheme. Maturing in the second half of the 18th century, it provided the instrumental vehicle for much of the most profound musical thought until about the middle of the 19th century, and has continued to figure largely in the methods of composers down to the present day.

      The basic elements of sonata form are three: exposition, development, and recapitulation, in which the musical subject matter is stated, explored or expanded, and restated. There may also be an introduction, usually in slow tempo, and a coda, or tailpiece, but these optional sections do not affect the basic structure. Although sonata form is sometimes called first-movement form, the first movements of multimovement works are not always in sonata form, nor does the form occur only in first movements. Likewise, another name for it, sonata-allegro form, is misleading, for it need not be in a quick tempo such as allegro.

      At first glance sonata form may appear to be a species of three-part, or ternary, form. The three parts of ternary form are a first section (A), followed by a contrasting section (B), followed by a repetition of the first section (that is, A B A). The parts are interrelated not in terms of basic structure but by purely lyrical or character contrast. Actually, the three parts of sonata form developed out of the binary (binary form), or two-part, form prominent in the music of the 17th and early 18th centuries. In binary form the structure depends on the interrelationship not only of themes but also of tonalities, or keys (key), the particular sets of notes and chords used in each part. Thus, the initial part, which is repeated, leads directly into the second part by ending in the new key in which the second part begins. The second, also repeated, moves from the new key back to the original key, in which it ends. The second part thus completes the first.

      In sonata form the exposition corresponds to the first part of binary form, the development and recapitulation to the second. The exposition moves from the original key to a new key; the development passes through several keys and the recapitulation returns to the original key. This echoes the motion, in binary form, away from and back to the original key. In relation to binary form, sonata form is complex. It offers, in the exposition, contrasting musical statements. In the development these are treated dialectically; that is, they are combined, broken up, recombined, and otherwise brought into change and conflict. In the recapitulation they are restated in a new light. This organic relationship between parts marks the sonata form as a higher, more complex, type than the ternary form. The occasional designation of sonata form as compound binary form is useful in that it stresses its origins in the earlier form, but notes its added complexity.

      The emphasis on contrast, even conflict, is the element that distinguishes the exposition of a sonata-form movement from the first section of an earlier binary form. The first section of a binary movement in a Baroque suite or instrumental sonata, for example, might contain two clearly differentiated themes, but the stress is on continuity and on uniformity of musical texture rather than on contrast. In sonata form the emphasis is more dynamic; there is a stronger sense of contrast within the movement. The terms usually given the contrasting areas are “first subject/second subject” or “principal group/subsidiary group.” These are misleading terms, for they imply a simple contrast of themes.

      In reality it is contrast of key, or tonal contrast, that characterizes the sonata exposition. Usually the opening of the exposition is firmly rooted in the tonic, or “home,” key of the work. The later segments of the exposition move decisively to a closely related but distinct key. The second key chosen is almost invariably one of the two keys most closely related to the home key. If the home key was a major key, the dominant key is chosen; if the home key was minor, the relative major is chosen. (The dominant key is the one whose keynote is five tones above that of the tonic, as C–G; the relative major has a keynote three tones above the relative minor, as A minor–C major.) The exposition thus creates an opposition of tonalities or key areas that the rest of the movement—the development and recapitulation—will strive to reconcile. Compared with the contrast of keys, the question of how many themes the movement possesses is of minor structural significance. Very often, a movement in sonata form has two clearly defined main themes, for example the first movement of Mozart's (Mozart, Wolfgang Amadeus) Symphony No. 41 in C Major. It may also have only one, like the first movement of Haydn's Symphony No. 85 in B Flat Major. Or it may have more than a half dozen strongly characterized themes, as does the first movement of Brahms's Fourth Symphony.

      The thematic organization of a movement in sonata form may affect the character of the exposition, and thus of the whole movement, in two specific respects. When two themes or groups of themes are clearly differentiated, their distribution may help the listener to assimilate the cardinal points of the tonal design (that is, the arrangement of keys) of the movement. When, on the other hand, such differentiation between themes is obscured or set at variance with the organization of tonalities, the very tension between thematic design and tonal scheme may greatly enhance the subtlety and interest of the form. Such tension may produce not merely an interplay of melody and key within the movement but an interplay between two interplays. One fairly simple way of achieving this is shown in the first movement of Haydn's (Haydn, Joseph) Symphony No. 99 in E Flat Major. Here, as in No. 85, the first theme is restated in the dominant key. This restatement could appear at first to be the second subject. But later it is followed by another distinct motive that, in terms of themes, is the real second subject. At the same time the neat, almost epigrammatic character of the second subject makes it similar to a codetta theme, which is often used to round off the exposition after both main subjects have been stated.

      In the first movement of Mozart's Symphony No. 35 in D Major (Haffner) this interplay of interplays reaches a higher level of subtlety. The second theme, against which the first persists as a counterpoint, is stated “on” rather than “in” the dominant; that is, its harmonies suggest the dominant key, but remain part of the home, or tonic, key. The second theme is thus heard as a new perspective on the tonic. Later, when the dominant key is firmly established in its own right, Mozart introduces a new subject whose tune is closely related to the first theme. In this richly ambiguous structure, the newly introduced motive would be regarded by the criterion of key, as the second subject; in purely thematic terms, it might almost be said to constitute the beginning of the codetta, or concluding section.

      The functions of the other two main sections follow naturally from what has been established in the exposition. Their purpose is to discuss and resolve the conflicts of tonality and theme that the exposition has raised. The development is an area of tonal flux—it usually modulates (modulation), or changes key, frequently, and any keys it settles in are likely to be only distantly related to the keys found in the exposition. It frequently proceeds by breaking the principal themes down into smaller elements and bringing these elements into new tonal or contrapuntal relations with each other. That is, themes or fragments of themes may appear in new keys; they may be combined to form apparently new melodies; they may be played against each other as counterpoint, or countermelody. One of the finest illustrations of the methods of development used in the Classical period occurs in the first movement of Mozart's Symphony No. 38 in D Major (Prague). Another resource of development is to seize on an apparently minor feature of the exposition and, by developing it extensively, to demonstrate its hidden importance. Another is to introduce entirely new material. This may provide a moment of relief in the course of a rigorous argument (as in the last movement of Mozart's Piano Sonata in C Major, K. 330); or it may allow the composer to expand the scope of a large-scale movement (as in the first movement of Beethoven's (Beethoven, Ludwig van) Symphony No. 3 in E Flat Major, the Eroica).

      Sometimes such a theme may only seem to be new. In the first movement of Beethoven's Symphony No. 4 in B Flat Major, for instance, the theme in the development that is usually described as “new” is really a decorated version of a motive already heard in the exposition.

      One common tactic in the Classical development is to begin the section with the codetta theme that ended (coda) the exposition. The first movement of Beethoven's Cello Sonata No. 2 in G Minor, Opus 5, No. 2, is an example.

      The impact of this device, and of the development section as a whole, is often obscured by the common tendency among modern performers to ignore the composer's instruction, present in almost all sonata form movements of the Classical period, to repeat the entire exposition. When this repetition is omitted, the thematic balance of the movement is upset and the dramatic effect of the development's sudden departure from an established regularity can be ruined. Music is an art to which the controlled use of time is basic. The temporal structure of a movement cannot be altered without seriously changing the proportions of the whole.

      Like the beginning of the development section, the point at which development passes into recapitulation is one of the most important psychological moments in the entire sonata structure. It marks the end of the main argument and the beginning of the final synthesis for which that argument has prepared the listener's mind. The Classical masters differ in their handling of this juncture. All usually prepare for it with a long passage of gathering tension. In Mozart the return of the tonic key and subject is managed with understated punctuality, the actual moment of recapitulation gliding in almost unnoticed. Haydn and Beethoven tend to celebrate its advent with panoply.

      The recapitulation presents the principal subject matter of the movement in a new state of equilibrium. The main subjects of the exposition are heard almost always in the same order as before, but now both subjects are typically in the tonic key, whereas in the exposition the first was in the tonic, the second in the dominant key. As a result of the musical events in the development, the listener perceives the subjects in a new relationship—rather like a traveller who glimpses the constituent parts of a valley separately as he climbs a hill and then, when he reaches the summit, sees the entire landscape for the first time as a whole. The recapitulation can vary greatly in the literalness with which it repeats the elements of the exposition. Sometimes, as in the first movement of Mozart's Sonata in B Flat Major, K. 570, a tiny modification in the transition that originally led from the tonic to the dominant key is enough to effect the necessary change of key perspective and keep the second subject in the tonic key. In other cases (the first movement of Beethoven's Eroica Symphony, for instance, and many of Haydn's symphonic movements) far-reaching modifications and reshufflings of the original material are made in the recapitulation. As in any living manifestation of a principle of musical form, the methods differ vastly from work to work; but the effect is always to bring about the reconciliation of opposites that is essential to sonata form.

      A large-scale sonata movement often creates conflicts of key and theme that cannot be completely settled even by the full process of recapitulation. In this case, the movement may be rounded off with a coda, or concluding section. Beethoven often extends the coda so greatly that it becomes almost a second development section, as in his Appassionata piano sonata. But this is no more an essential element of sonata form than the introduction that may precede the main movement.

      The form described above is that exemplified in most first movements of sonatas, and of sonata-style compositions, in the Classical period. There are usually two, three, or four movements in the entire work. Two-movement and, more particularly, three-movement schemes are most common in sonatas for one or two instruments. Symphonies and string quartets almost always have four movements, and Beethoven, particularly in his earlier period, sometimes expanded the scheme of the instrumental sonata to four movements too.

      The first movement in all of these patterns is usually fast; the second commonly provides the contrast of a slower tempo; and the last in most cases is again fast. When there are four movements, a simpler, dance-style movement of the type also found in the suite is included. This is usually placed between the slow second movement and the finale; in some cases it stands second and the slow movement third.

      The forms of these other movements vary much more than that of the first, which in Classical examples is almost invariably the weightiest. Since their function is to complement the experience of the first movement through a new but related range of contrasts, their scope and manner depend on the point to which the issues of the work have already been taken. Simple ternary (A B A) form and variation form (i.e., theme and variations (musical composition)) are among the most common patterns for the slow movement, but rondo and sonata forms are also used. In rondo form a recurring theme is contrasted with a number of intervening themes, as A B A C A. When sonata form is used in slow tempos, the demands of overall proportion frequently cause the omission of the development section. Sonata form, rondo, and, less often, variation form are also used for the final movement. In final movements, also, the simple rondo pattern (A B A C A) is often expanded into A B A-development-B A, with B in the dominant key at its first appearance and in the tonic key at its second. The result is a hybrid form known as sonata-rondo.

      In the first part of the Classical period, the dance movement, when it appeared, usually consisted of a minuet in fairly simple binary form (the two-part form from which sonata form evolved). This was followed by a second minuet known as the trio, which tended in orchestral works to be more lightly scored. The first minuet was then repeated, normally without its own internal repeats. The minuet-trio-minuet structure forms an overall ternary pattern. Haydn frequently, and Beethoven still more often, chose to speed the traditional minuet up to the point at which it lost its dance character and became a scherzo, a quick, light movement usually related to the minuet in form. In some extreme cases, such as the ninth symphonies of both Beethoven and Schubert, the binary structures of both scherzo and trio were expanded into small but complete sonata-form structures. In this way, as with the sonata-rondo, the principles of thematic development and key contrast spread during the Classical period as the sonata form began to influence other movements.

      Such are the outlines of the most fertile form in Western instrumental music since 1750. Before discussing its origins, growth, and later modification, there should be a warning against phrases like “true sonata form.” If sonata form as described is considered the sole “true sonata form,” the implication is that instrumental sonatas written in forms other than sonata form are not genuine.

      Actually, the principle exemplified in sonata form represents one way of organizing the passage of sound through time. Its scope is enormous; it was the basis for some of the greatest works of Western music; and it still contains the seeds of potential further development. But it is only one episode in a complex chronicle of styles and principles of musical organization. In contrast to earlier forms, it emphasizes conflict instead of continuity and derives its impact from the explosive power of tonal organization instead of the smoother influence of melody.

History of the sonata
      The sonata in all its manifestations has roots that go back long before the first uses of the actual name. Its ultimate sources are in the choral (choral music) polyphony of the late Renaissance (music having several equal melodic lines, or voices). This in turn drew at times on both liturgical and secular sources—on the ancient system of tones or modes of Gregorian chant, and on medieval European folk music. These two lines were constantly interweaving. Popular tunes, for example, were used as the starting point for masses and other religious compositions from the 15th to the early 17th centuries. Sacred and secular elements influenced the development of both the sonata and the partita (or suite) of the Baroque period.

Early development in Italy
      The specific musical procedures that were eventually to be characteristic of the sonata began to emerge clearly in works by the Venetian composers of the late 16th century, notably Andrea Gabrieli (Gabrieli, Andrea) (c. 1520–86) and Giovanni Gabrieli (1556–1612). These composers built instrumental pieces in short sections of contrasted tempo, a scheme that represents in embryo the division into movements of the later sonata. This approach is found not only in works entitled “sonata,” such as Giovanni Gabrieli's Sonata pian' e forte (Soft and Loud Sonata) of 1597, which was one of the first works to specify instrumentation in detail; the instrumental fantasia and the canzone, an instrumental form derived from the chanson or secular French part-song, display a similar sectional structure. Like early sonatas, they were often contrapuntal (i.e., built by counterpoint, or the interweaving of melodic lines in the different voices, or parts). At this stage sonatas, fantasias, and canzoni were often indistinguishable from each other, and from the fuguelike ricercare, though this form is generally more serious in character and more strictly contrapuntal in technique.

      In the 17th century stringed instruments (stringed instrument) eclipsed the winds (wind instrument), which had played an at least equally important role in the sonatas and canzoni composed by the Gabrielis for the spacious galleries of St. Mark's Cathedral, Venice. Claudio Monteverdi (1567–1643) devoted more of his energies to vocal than to instrumental composition. The development of instrumental writing—and of instrumental musical forms—was carried on more and more by virtuoso violinists. One of these was Carlo Farina (flourished c. 1630), who spent part of his life in the service of the court of Dresden, and there published a set of sonatas in 1626. But the crowning figure in this early school of violinist-composers was Arcangelo Corelli (Corelli, Arcangelo) (1653–1713), whose published sonatas, beginning in 1681, sum up Italian work in the field to this date.

      Apart from their influence on the development of violin technique, reflected in the works of such later violinist-composers as Giuseppe Torelli (1658–1709), Antonio Vivaldi (1678–1741), Francesco Maria Veracini (1690–c. 1750), Giuseppe Tartini (1692–1770), and Pietro Locatelli (1695–1764), Corelli's sonatas are important for the way they clarify and help to define the two directions the sonata was to take. At this point the sonata da chiesa, or church sonata, and the sonata da camera, or chamber sonata, emerged as complementary but distinct lines of development.

      The sonata da chiesa usually consists of four movements, in the order slow–fast–slow–fast. The first fast movement tends to be loosely fugal in style (i.e., using contrapuntal melodic imitation), and thus reflects, most clearly of the four, the sonata's roots in the fantasia and canzone. The last movement, by contrast, is simpler and lighter, often differing from the dance style typical of the sonata da camera only in that its sections are not repeated. The sonata da camera is altogether less serious and less contrapuntal than the sonata da chiesa, and it tends to consist of a larger number of shorter movements in dance style. If the sonata da chiesa was the source from which the Classical sonata was to develop, its courtly cousin was the direct ancestor of the suite, or partita, a succession of short dance pieces; and in the 18th century, the terms suite and partita were practically synonymous with sonata da camera. The two streams represented by church and chamber sonatas are the manifestation, in early Baroque terms, of the liturgical and secular sources found in Renaissance music. The Baroque style flourished in music from about 1600 to about 1750. Down to the middle of the 18th century the two influences maintained a high degree of independence; yet the injection of dance movements into the lighter examples of the sonata da chiesa and the penetration of counterpoint into the more serious suites and sonate da camera show that there was always some cross-fertilization.

      Another characteristic of the Baroque sonata that Corelli's work helped to stabilize was its instrumentation. Around 1600 the musical revolution that began in Italy had shifted emphasis from the equal-voiced polyphony of the Renaissance and placed it instead on the concept of monody, or solo lines with subordinate accompaniments. The comparatively static influence of the old church modes was superseded by the more dramatic organizing principle of the major–minor key system with its use of contrast of keys. Although counterpoint continued to play a central role in musical structure for another hundred years and more, it became a counterpoint that took careful account of the implications of harmony and of chords within the framework of the major and minor keys.

      In this context the continuo, or thorough bass (basso continuo), assumed primary importance. The composer that used a continuo part wrote out in full only the parts of the upper melody instruments. The accompaniment, which was the continuo part, was given in the form of a bass line, sometimes supplemented with numbers, or figures, to indicate main details of harmony, whence the term “figured bass.” The continuo was “realized,” or given its performed form, by a low melody instrument (viola da gamba, violone, or later cello or bassoon) in collaboration with an organ, harpsichord, or lute. The collaborating (musical composition) instrument improvised the harmonies indicated by the figures or implied by the other parts and so filled the gap between the treble and bass lines.

      In Corelli's work, “solo” sonatas, for one violin with continuo, are found alongside others for two violins and continuo described as sonatas a tre (i.e., for three), early examples of the trio sonata that was the principal chamber-music form until about 1750. The use of “trio” for sonatas played by four instruments is only superficially paradoxical: although trio sonatas were played by four instruments, they were considered to be in three parts—two violins and continuo. Moreover, specific instrumentation at this period was largely a matter of choice and circumstance. Flutes or oboes might play the violin parts, and if either harpsichord or cello or their substitutes were unavailable, the piece could be played with only one of them representing the continuo. But a complete continuo was preferred.

      Corelli's importance is as much historical as musical. Perhaps because a vigorous line of Italian composers of violin music followed him, he is commonly accorded the main credit for late 17th-century developments in sonata style. But his undeniably vital contribution should not distract attention from equally important work that was done around the same time outside Italy.

Early development outside Italy
      In France Jean-Baptiste Lully's (Lully, Jean-Baptiste) lucrative monopoly of music at the royal court and the immense popularity of spectacular ballets used as courtly entertainments naturally led, through François Couperin (Couperin, François) (1668–1733), to a concentration on the smaller dance forms found in the ballet and courtly social dance. This concentration gave the French school its preeminence as producer and influencer of the 18th-century dance suite. The French, thus occupied with dance music, had little effect on the growth of the sonata da chiesa. But in Germany, where in 1619 Michael Praetorius (Praetorius, Michael) (1571–1621) published some of the earliest sonatas, the sonata developed from an originally close relation to the suite into a more ambitious blend. As it evolved it combined the suitelike multisectional structure of the sonata da camera with the contrapuntal workmanship and emotional intensity of the Italian sonata da chiesa form.

      One of the first contributors to this development of the Italian influence was the Austrian composer Johann Heinrich Schmelzer (c. 1623–80). In Nürnberg in 1659 he published a set of trio sonatas for strings, following it in 1662 with a set for mixed strings and wind instruments, and in 1664 with what may have been the first set of sonatas for unaccompanied violin. The German composer Johann Rosenmüller (c. 1620–84) spent several years in Italy; his Sonate da camera cioè sinfonie (i.e., suites or symphonies), published in Venice in 1667, are essentially dance compositions. But 12 years later, in Nürnberg, he issued a set of sonatas in two, three, four, and five parts that vividly illustrate the German trend toward more abstract musical structure and expressive counterpoint. During this period even pieces with dance titles began to lose their danceable character and became compositions meant only for listening.

      Meanwhile, the greatest member of this school, Heinrich Ignaz Franz von Biber (Biber, Heinrich) (1644–1704), published several sets of sonatas—some for violin and continuo, others in three, four, and five parts. In these, from 1676 onward, he took a penchant for expressiveness to extremes of sometimes bizarre but often gripping profundity that contrast sharply with the bland, polished style of Corelli. The titles of some of Biber's sets of sonatas specifically indicate his aim of reconciling church and chamber styles. The 1676 publication, for instance, is entitled Sonatae tam aris quam aulis servientes (Sonatas for the Altar as Well as the Hall). And being himself, like Corelli, a violinist of extraordinary powers, Biber made a valuable contribution to the development of instrumental technique in a set of sonatas for unaccompanied violin in which the practice of scordatura (adjustment of tuning to secure special effects) is ingeniously exploited.

      The English (England) composers were achieving a comparable intensification of expression during the 17th century, though in their case the technical starting point was different. In accordance with the characteristic time-lag of the English in the adoption of new European musical methods, the English continued to work with polyphony in the Renaissance manner, while the Italians were perfecting monody and the Germans fruitfully uniting monody with their own contrapuntal tradition. English polyphony in the 17th century attained a remarkable level of technical finish and emotional grandeur. Thomas Tomkins (1572–1656), Orlando Gibbons (1583–1625), John Jenkins (1592–1678), and William Lawes (1602–45) were the chief agents of this refining process. They and their predecessors, notably John Coperario (c. 1575–1626), made a gradual transition from the string fantasia bequeathed by William Byrd and other composers during the reign of Elizabeth I (1558–1603) and approached the new kind of musical form associated with the Baroque sonata; but they always stayed closer than their continental colleagues to the spirit of polyphony.

      When Henry Purcell (Purcell, Henry) (c. 1659–95), in his three-part and four-part sonatas, submitted this rich English tradition to the belated impact of French and Italian influence, he produced a fusion of styles that was the highest point of musical inspiration yet reached by the emergent sonata form.

The Baroque era
      The years from the end of the 17th century to the middle of the 18th represent a moment of equilibrium in the interaction of counterpoint and monody that had created the Baroque sonata. The continuo device, as long as it endured, was a sign that the balance still held—and it did endure as long as the trio sonata kept its central position as a chamber-music medium. During the first half of the 18th century the later Italian violinists, most notably Vivaldi (Vivaldi, Antonio), were prolific creators of trio sonatas. Sometimes they leaned to a three-movement pattern (fast–slow–fast), influenced by the direction the Italian operatic sinfonia, or overture, was taking. More often the old four-movement pattern was preserved. In this well-tested shape, too, Georg Philipp Telemann (Telemann, Georg Philipp) (1681–1767) produced hundreds of examples that maintained a remarkably consistent standard of musical interest, George Frideric Handel (Handel, George Frideric) (1685–1759), working for most of his life in England, composed some trio sonatas, and also some valuable sonatas for solo instrument with continuo. In France, Joseph Bodin de Boismortier (1691–1755) and the violinist Jean-Marie Leclair the elder (1697–1764) cultivated both solo and trio genres with charm although with less profundity.

      Yet even while the sonata with continuo flourished, the forces of tonality, or organization in terms of keys, developed intensely toward a use of key contrast that would eventually drive the trio sonata from the scene. The continuo itself was being undermined by the growth of interest in instrumental colour, and the figured bass could not long survive the tendency toward scoring for specific instruments and exhaustive detailed musical notation.

      Beginning in 1695 Johann Kuhnau (Kuhnau, Johann) (1660–1722) had published the first sonatas for keyboard instrument alone, some of them programmatic pieces on biblical subjects. J.S. Bach (Bach, Johann Sebastian) (1685–1750), the greatest composer of Baroque sonatas, continued the move away from the treatment of the keyboard in the subordinate, “filling-in” capacity that was its role in the continuo. He wrote a small number of trio sonatas after the traditional scheme, and also a few violin and flute sonatas with continuo; but at the same time he produced the first violin sonatas with obbligato harpsichord parts (that is, obligatory and fully written out, rather than improvised), others for flute or viola da gamba with obbligato harpsichord, and three sonatas (along with three partitas) for unaccompanied violin.

      In these works, as in some of Telemann's later sonatas, the power of key or tonality to articulate sections of musical structure, and its ability to provide a harmonically derived eventfulness—a sense of expectation succeeded by fulfillment—began to make itself felt. These powers of key are the seed from which the Classical sonata form originated. But at this point the dualism engendered by tonal and thematic contrast had not yet supplanted the more continuous, unitary processes at work in a composition based on counterpoint. Nor was the consciousness of tonality any more advanced in the otherwise forward-looking work of Domenico Scarlatti (Scarlatti, Domenico) (1685–1757). His harpsichord sonatas—555 movements survive, many designed to be played in pairs or in groups of three—are often original to the point of idiosyncrasy in expression. They introduced a valuable new flexibility in the treatment of binary form, and they had a powerful effect on the development of keyboard writing. But in formal terms they still belong in the old world of unity—even their strongest contrasts have an air of being suspended in time, quite unlike the far-ranging effects of conflict through time that are the basis of the Classical sonata.

      A later generation of composers completed the transition from Baroque to Classical sonata. One of J.S. Bach's sons, Carl Philipp Emmanuel Bach (Bach, Carl Philipp Emanuel) (1714–88), plunged enthusiastically into the new resource of dramatic contrast. In about 70 harpsichord sonatas, and in other works for chamber ensembles and for orchestra, he placed a new stress on key contrast not only between but, more important, within movements. Correspondingly, he emphasized the art of transition.

      In the development of sonata form in orchestral (orchestra) music, particular value attaches to the work of the Austrians Georg Matthias Monn (Monn, Matthias Georg) (1717–50) and Georg Christoph Wagenseil (1715–77) and of the Italian Giovanni Battista Sammartini (Sammartini, Giovanni Battista) (1701–75). All three played vital roles in shaping the symphony, which assumed an importance equal to that of the solo or small-ensemble sonata. Their symphonies further stressed the individual characterization of themes and, in particular, the use of the second subject to shape form. Another of Bach's sons, Wilhelm Friedemann Bach (1710–84), made sporadic but interesting contributions to this development, and a third, Johann Christian Bach (1732–82), who settled in London, exploited a vein of melodic charm that influenced Mozart.

The Classical era and later
      By about 1770 most of the specific changes that dictated the shift from Baroque sonata to Classical sonata were firmly established. Through the work of the Neapolitan school of opera led by Domenico Scarlatti's (Scarlatti, Alessandro) father Alessandro (1660–1725), the operatic sinfonia, or overture, had streamlined the traditional sonata da chiesa. It omitted the opening slow movement and abandoned the fugal manner that was the first allegro's link with the past. In the new three-movement pattern, a minuet sometimes replaced the fast, abstract finale. In other cases, the inclusion of both minuet and finale brought the number of movements back to four. The south German Mannheim school of composers —most notably Johann Wenzel Stamitz (Stamitz, Johann) (1717–57) and his son Karl (Stamitz, Carl) (1745–1801)—developed the technique of the orchestra, whose resources now provided an ideal laboratory for experimentation with the dramatic effects of tonal contrast.

      By this time the Classical sonata proper (i.e., with at least one movement in sonata form), whether in the medium of sonata, trio, quartet, quintet, or symphony, could provide a vehicle for consolidating the process begun nearly two centuries earlier by the revolution from equal-voiced polyphony to monody, with its emphasis on melody and harmony. The Rococo style of the mid-18th century, generally known as style galant, had attained a halfway stage in which counterpoint had been virtually dropped and tunes had occupied the forefront of interest. But now, in the mature Classical style of Haydn (Haydn, Joseph) and Mozart, superficial melodic interest was in turn subordinated. In this style the value of tunes lay in their role as functions of tonality. Key by this time had had assumed a central role as the fundamental articulator of form. As a corollary, musical themes were often, though not always, reduced to the status of mere motives, or tags. The theme's harmonic implications, which contribute to the feeling of key, took precedence over its attractiveness as melody.

      The new musical principle—that of contrast of key—reached full expression in Haydn and Mozart through their use of sonata form as a principle of musical organization. Haydn's most valuable work in the sonata form is found in his series of over 80 string quartets, over 100 symphonies, 52 keyboard sonatas, and 31 trios for piano, violin, and cello. Unlike Haydn, Mozart was at his greatest in the fields of opera and of the solo concerto. (The latter, though it shared with sonata form such elements as the central principle of key contrast, was a medium that evolved, through the Baroque concerto grosso, from the fundamentally different source of the solo vocal aria and the vocal-instrumental concerto.) But in the last six symphonies, the last 10 string quartets, about a dozen keyboard sonatas, and several trios, quartets, quintets, and serenades, Mozart achieved outstanding examples of sonata structures. The formerly prominent sonata for violin plays a relatively minor part in both men's output: the violin had been eclipsed by the rise of interest in keyboard instruments. It was reintroduced almost surreptitiously as a distinctly subordinate partner and regained a leading role only toward the end of the 18th century in Mozart's later violin sonatas and then in Beethoven's.

      The strikingly individual details in Haydn's and Mozart's handling of sonata form are all features consonant with the general outlines of the form. Examples of different approaches include Haydn's taste for combining dualistic key schemes with monistic thematic material (that is, the use of the same basic theme in both keys). He also frequently set slow movements in keys only distantly related to the key of the first movement. Mozart preferred strongly differentiated themes, and he often reshaped his second subjects drastically when they reappeared in the recapitulation. Beethoven, in his sonata compositions (preeminently, the 32 piano sonatas, the 16 string quartets, the trios, the 9 symphonies, and the sonatas for violin and for cello), retained the basic sonata form. But he vastly extended its scale; e.g., by increasing the importance of the coda, or concluding section, and by using unusual keys in the exposition, which was greatly increased in length. He also introduced extramusical implications of a profound philosophical nature. In his later sonatas and quartets he began to move away from the dualistic sonata principle and back to the monistic approach exemplified in variation form and fugue.

      The case of Franz Schubert (Schubert, Franz) (1797–1828) is quite different. The first movement of the Symphony No. 5 in B Flat Major (written when he was 19) is one among several places that illustrates a changing attitude to sonata principles. In the recapitulation of this movement, the first theme (Romanticism) is given in the subdominant key (the key whose keynote is five tones below that of the tonic, or home key, as F–C, just as the tonic's keynote is five tones below that of the dominant key, as C–G). This device enables Schubert to place the second theme in the tonic key (the goal of the recapitulation) without altering the transition between the two themes; for the same passage that, in the exposition, took the music from the tonic to the dominant serves, in the recapitulation, to take it from the subdominant to the tonic. This essentially labour-saving procedure is evidence of a certain lack of patience with the workings of sonata form as hitherto practiced. Up to this time, sonata form, first treated as a textbook study after Schubert's death, was not a set of rules codified by theorists and followed by composers. Rather, it was a principle of composition that grew out of earlier forms and that can be generalized from an examination of the actual work of Haydn, Mozart, Beethoven, and their contemporaries.

      Schubert's interests lay in new directions, and the first steps in two such directions are to be found in the greatest of his instrumental works. His later sonata-form compositions in all media—when they follow the rough traditional scheme of exposition, development, and recapitulation—modify it substantially. He frequently expanded the number of tonal centres (central keys) in the exposition, and sometimes also the number of basic themes, from two to three. This tendency to expansion affects the whole subsequent course of the Austro-German symphonic tradition. It is the direct ancestor of the expositions of Anton Bruckner (Bruckner, Anton) (1824–96), with their three distinct thematic groups, and of the vastly extended sonata structures of Gustav Mahler (Mahler, Gustav) (1860–1911). At the same time, Schubert's Fantasy in C Major (Wanderer) for piano (1822) exemplifies an opposite 19th-century trend toward contraction, through the fusion of the sonata's formerly separate movements in one closely integrated whole: the four movements of the fantasy are based on transformed versions of a single theme. Similarly, in France, Hector Berlioz (Berlioz, Hector) (1803–69) in his Symphonie fantastique transformed the theme representing the artist's beloved (the idée fixe, or fixed idea) so that it took different forms in each movement. In this case the transformation was affected by the program (program music) or “plot” of the symphony. This was a departure from the abstract, or plotless, character of the Classical sonata. The tendency to fusion—that is, to thematic unity between movements—was the source of the thematic transformations used in symphonic poems (symphonic poem), such as those of Franz Liszt (1811–86), as a basic principle of musical structure. But in these works the program rather than any abstract musical form suggests the particular course of the transformation of the themes. For this reason their specific form does not depend, as did that of the Classical sonata, on the exposition–development–recapitulation principle of contrast, conflict, and reconciliation of keys. A corresponding evolution away from the Classical form of the sonata for one instrument occurs in Liszt's one-movement Piano Sonata in B Minor (1853). In this work he used a single extended movement with subdivisions analogous to the sections of sonata form. But the specific use of his four themes, which are transformed and combined in free fashion, departs from the usual order of the classical Sonata.

      Robert Schumann (Schumann, Robert) (1810–56) likewise experimented fruitfully, especially in his Symphony No. 4 in D Minor, with the Schubertian idea of fusing movements together. The tendency to use thematic transformation in a manner that moved away from the Classical sonata form was complemented by César Franck (Franck, César), who adhered to the basic form but from 1841 utilized a “cyclic (cyclic form)” approach; that is, one of fusion, or thematic relationships between movements. Brahms, on the other hand, carried the more familiar Classical sonata form to its highest point of complexity. In addition to making valuable innovations in rhythmic structure, he gave the role of counterpoint a new lease of vigour and interest and used the concept of thematic relationships between movements in a particularly subtle way. Chopin's (Chopin, Frédéric) three piano sonatas are concerned more with lyrical expression than with innovative formal methods. Similarly, the sonata compositions of Carl Maria von Weber (1786–1826) and Felix Mendelssohn (1809–47), which generally followed the patterns of their Classical predecessors and were highly regarded in their day, contributed little to the evolution of sonata form away from its Classical state. This evolution, illustrated by the works of Berlioz and Liszt, was carried forward by Mahler. In his symphonies expansion, through inclusion of more than two tonal centres and groups of themes, and fusion, or the creation of unity between movements, are combined. This gives rise to expansive compositions held together by complex interrelationships between themes. Arnold Schoenberg (Schoenberg, Arnold) (1874–1951), in such works as his First String Quartet (1904), carried the idea of fusion of movements to its logical conclusion: this is a one-movement work with contrasting sections in which all the themes used are derived from a few basic motives.

      Two important 19th-century developments tended to weaken the effectiveness of the Classical sonata form (music) as an organizing principle. One, exemplified by Richard Wagner (Wagner, Richard) (1813–83), was an increasing use of chromaticism; that is, of notes and chords foreign to the key in which a passage of music is written. Chromaticism, when used extensively, broke down key feeling. Instead of being heard as a contrast to, or special modification of, the key, it became so prominent that the key itself was not heard strongly enough to establish itself in the listener's mind. Secondly, Liszt and his followers weakened the sonata form by using in their symphonic poems musical organizations based on program rather than on contrast of keys. But although the effectiveness of key as a basis for musical organization was weakened by the late 19th century, Mahler and Carl Nielsen (Nielsen, Carl) (1865–1931) provided a modification of the sonata form that made use of tonality in a new way. This innovation, progressive tonality, used the home key as a goal to be worked toward from more or less distant key regions, so that a work ends in a different key from the one in which it began. Mahler and Nielsen arrived at the same notion independently at the same time. Nielsen's First Symphony and Mahler's Second Symphony (both 1894) are the first to use progressive tonality, and both composers forged highly individual new forms from it.

      Most compositions written in sonata form after Wagner's era, however, lack a certain sense of vitality. Frequently, because the effectiveness of key or tonality has been weakened, such compositions centre on melody without the strong contrast of tonality that underlay the Classical sonata. Some composers made stylistic compromises. Schoenberg's Fourth String Quartet used his 12-tone (12-tone music) (dodecaphonic) approach to composition, an approach that began with a “row,” or series, of the 12 tones of the chromatic scale, chosen by the composer to serve as the melodic and harmonic basis for the composition. In this work he fits the 12-tone style into the outlines of sonata form. The result is based on contrasting themes, rather than on the Classical sonata principle of key contrast, because 12-tone music, being atonal, deliberately avoids the creation of a sense of key. In a comparable way, though in the context of a different style, some of the sonatas of Sergey Prokofiev (Prokofiev, Sergey) (1891–1953) use the outward formal divisions of the classical sonata form but stress the interest of melody as such, leaving tonality—still present in this case—to play a decorative rather than a structural role.

New principles of musical form
      Other modern composers developed new principles of musical form. Although these principles appear in genres traditionally associated with the sonata, such as instrumental sonatas, string quartets, and orchestral works, they vary in the degree to which they are or are not related to the Classical sonata form.

      One of the more useful of such principles has been the technique of constructing large-scale compositions from transformations and developments of a single germinal motive, often merely two or three notes. Like Schoenberg's approach, in which a 12-tone row is transformed, this is actually the application at a more radical and consistent level of the 19th-century principle of thematic transformation. The symphonies of Jean Sibelius (Sibelius, Jean) (1865–1957) are based on this method. So are those of Ralph Vaughan Williams (Vaughan Williams, Ralph) (1872–1958), who also used some of the features of sonata form but imaginatively reshaped them and transformed their proportions to suit his purpose. In the nonsonata works of Schoenberg and his pupils Alban Berg (1885–1935) and Anton Webern (1883–1945), the 12-tone method produced legitimate new forms of the highest historical importance; but when forced into an uncomfortable liaison with earlier schemes of organization such as the sonata, its effectiveness diminished. In the works of Béla Bartók (Bartók, Béla) (1881–1945), passages built on folk music scales, rather than on the major and minor scales of 18th- and 19th-century keys or tonalities, are used alongside atonal passages. His musical structure frequently takes the form of a combination of elements of sonata form with a simple “archlike” structure such as A B C B A. Paul Hindemith (Hindemith, Paul) (1895–1963) contributed copiously to the sonata medium with works for almost every known instrument, but as far as the form was concerned his innovations were of minor significance. Sir Michael Tippett (Tippett, Sir Michael) in his Second Symphony and sonatas (e.g., for piano; for four horns) uses tonality in a fresh and valid way, and he has effected a stimulating rapprochement of the sonata form with the equal-voice polyphony characteristic of the English fantasia and madrigal (a genre of part-song) of Elizabethan and Jacobean times. The Second Symphony of Wilfred Josephs shows yet another potentially valuable reinterpretation of the fused-movement approach to the sonata: its long first movement serves the function of exposition, three intermediate movements act on one level as development and on another level as a combination of slow movement and scherzo, and a brief finale serves as a kind of recapitulation.

      Other musical approaches use metre and instrumental tone colour to mark important musical points much as traditional sonata form used contrast of keys. Elliott Carter (Carter, Elliott) has combined a use of germinal motifs with a new rhythmic technique known as “metric modulation,” a controlled change of metre foreshadowed in Brahms by such passages as the end of the Second Piano Concerto. Carter's Sonata for Cello and Piano is an example of this use of metre. Carter also uses the idea of sharply differentiating the musical subject matter given to the individual instruments of an ensemble—a resource found earlier in the Second String Quartet of Charles Ives (1874–1954). Some of the many styles of Igor Stravinsky (Stravinsky, Igor) (1882–1971), particularly after his late adoption of the 12-tone approach, make ingenious use of germinal motifs; but his music really bases its structure on the juxtaposition of large blocks of distinct musical character, rather than on “development” in the sense traditionally associated with the sonata.

      Music in the latter half of the 20th century is too various in form, medium, esthetic attitude, and social function to allow any confident predictions. But all of these examples suggest that the sonata, and its special manifestation, the sonata form, can still provide composers with fertile areas of activity. As in the time of Haydn, Mozart, and Beethoven, success will continue to reward those who develop musical forms that grow naturally from the specific principles of composition used in their works, much as the sonata form grew out of the principle of contrast, conflict, and resolution of tonalities that characterized the sonatas, symphonies, and chamber music of the 18th and 19th centuries.

Bernard Jacobson

Additional Reading
E. Borrel, La Sonate (1951), a general modern study; W. Mellers, “The Sonata Principle from c. 1750,” in Man and His Music (1957), a description of stylistic trends that led from the Baroque to the Classical attitude; M. Bukofzer, Music in the Baroque Era, from Monteverdi to Bach (1947), a general survey covering the period of the pre-Classical sonata; D.F. Tovey, “Sonata Forms,” in The Forms of Music (1956), a brilliant study, Essays in Musical Analysis, vol. 1–2 (1935), perceptive program notes on specific symphonic works, Essays and Lectures on Music (1949), important studies of Haydn, Beethoven, Schubert, and Brahms, and A Companion to Beethoven's Pianoforte Sonatas (1931); F.H. Marks, The Sonata: Its Form and Meaning in Piano Sonatas by Mozart (n.d.); H. Keller, “Wolfgang Amadeus Mozart,” in R. Simpson (ed.), The Symphony, vol. 1 (1966), an imaginative and learned application of modern analytical principles to Mozart's symphonies; H.C. Robbins Landon, The Symphonies of Joseph Haydn (1955), a monumental, detailed study of one of the central areas of sonata-form history; Charles Rosen, Sonata Forms (1980), an exploration of the musical form in the context of social conditions.

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Universalium. 2010.

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