At first the term merely distinguished an instrumental piece from a piece with voice, which was called a cantata. Thus many early concertos, suites, and sets of variations were called sonatas. As the various instrumental forms acquired differentiated characteristics during the baroque period, the term began to identify two specific types: the sonata de chiesa, or church sonata, and the sonata da camera, or chamber sonata. Both were written most commonly for two melody instruments, usually violins or flutes, with a bass instrument and a keyboard instrument, both of which played the thorough bass (see figured bass). The sonata da chiesa was in four movements—slow, fast, slow, fast—and its contrapuntal style was largely derived from the canzone. The sonata da camera was basically a suite of dances, although nondance movements were added later.
In the late 17th cent. these two types merged into the outstanding baroque chamber music form, the trio sonata. This form was brought to perfection in the works of Arcangelo Corelli and François Couperin and adopted in the sonatas of J. S. Bach and Handel. In the later 18th cent. sonatas for groups of instruments began to be designated string quartet and symphony, and the term sonata was limited to pieces for one keyboard instrument or for one solo instrument (e.g., violin) with keyboard accompaniment. The keyboard sonata was developed in the works of rococo Italian composers such as Galuppi, G. B. Sammartini (1701-75), and P. D. Paradies (1707-91). This rococo sonata was more homophonic than the trio sonata, having one outstanding melodic line with accompanying harmonic background, such as the Alberti bass. In sonatas of this type, particularly those of C. P. E. Bach, an expressive quality and pianistic style were developed that influenced the classical sonata, perfected by Haydn, Mozart, and Beethoven.
The classical sonata's movements are usually fast-slow-fast, and a minuet or scherzo is often inserted before the last movement. The first movement—and possibly one or more of the others—was in what is called sonata form. This is essentially a binary form, the first part being an exposition of two (or sometimes three) contrasted themes. The second part consists of a development of these themes and a recapitulation of the beginning exposition. Sonata form is employed in the string quartet, in the symphony, and to some extent in the concerto, as well as in the solo sonata. After the classical era the most significant development was the use of one thematic idea in all movements, in each of which the basic idea is transformed in mood and character. This type of sonata was fully realized in the Sonata in B Minor of Franz Liszt.
See critical studies of the composers mentioned; W. S. Newman, The Sonata in the Baroque Era (3d ed. 1972), The Sonata in the Classic Era (2d ed. 1972), and The Sonata Since Beethoven (2d ed. 1972).
Principal chamber music genre of the Baroque era. Despite its name, it requires four performers: two melody instruments and continuo (usually a keyboard instrument and a bass instrument). It arose early in the 17th century as an instrumental version of the Italian vocal-duet ensemble. The two upper instruments, usually violins, generally wove their melodic, quasi-vocal lines high above the accompanying parts. Two standard forms emerged after 1750: the sonata da chiesa, or church sonata, standardized as a four-movement form (in slow-fast-slow-fast order); and the suite-like sonata da camera, or chamber sonata. By 1770 the genre had been abandoned in favour of the solo sonata.
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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.
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In the Classical period and afterwards, sonatas for piano solo were the most common genre of sonata, with sonatas for violin and piano or cello and piano being next. However, sonatas for a solo instrument other than keyboard have been composed, as have sonatas for other combinations of instruments, and for other instruments with piano.
The sonata da chiesa, generally for one or more violins and bass, consisted normally of a slow introduction, a loosely fugued allegro, a cantabile slow movement, and a lively finale in some binary form suggesting affinity with the dance-tunes of the suite. This scheme, however, was not very clearly defined, until the works of Johann Sebastian Bach and George Frideric Handel, when it became the essential sonata and persisted as a tradition of Italian violin music – even into the early 19th century, in the works of Boccherini.
The sonata da camera consisted almost entirely of idealized dance-tunes, but by the time of Bach and Handel such a composition drew apart from the sonata, and came to be called a suite, a partita, an ordre, or, when it had a prelude in the form of a French opera-overture, an overture. On the other hand, the features of sonata da chiesa and sonata da camera then tended to be freely intermixed. Bach, however, while not using the titles themselves, nevertheless keeps the two types so distinct that they can be recognized by style and form. Thus, in his six solo violin sonatas, Nos. 1, 3, and 5 are recognizably sonate de chiesa; and Nos. 2, 4, and 6 are explicitly called partitas, but are admissible among the sonatas as being sonate da camera. Bach is also cited as being among the first composers to have the keyboard and solo instrument share a melodic line, whereas previously most sonatas for keyboard and instrument had kept the melody exclusively in the solo instrument.
The term sonata is also applied to the series of over 500 works for harpsichord solo, or sometimes for other keyboard instruments, by Domenico Scarlatti, originally published under the name Essercizi per il gravicembalo (Exercises for the Harpsichord). Most of these pieces are in one binary-form movement only, with two parts that are in the same tempo and use the same thematic material, though occasionally there will be changes in tempo within the sections. Many of the sonatas were composed in pairs, one being in the major and the other in the parallel minor. They are frequently virtuosic, and use more distant harmonic transitions and modulations than were common for other works of their time. They are admired for their great variety and invention.
The genre – particularly for solo instruments with just the continuo or ripieno – eventually influenced the solo movements of suites or concerti that occurred between movements with the full orchestra playing, for example in the Brandenburg Concerti of Bach. The trio sonatas of Vivaldi, too, show parallels with the concerti he was writing at the same time.
The sonatas of Domenico Paradies are mild and elongated works of this type, with a graceful and melodious little second movement included. The manuscript on which Longo bases his edition of Scarlatti frequently shows a similar juxtaposition of movements, though without any definite indication of their connection. The style is still traceable in the sonatas of the later classics, whenever a first movement is in a uniform rush of rapid motion, as in Mozart's violin sonata in F (K. 377), and in several of Clementi's best works.
Initially the most common layout of movements was:
However, two-movement layouts also occur, a practice Haydn uses as late as the 1790s. There is also in the early Classical period the possibility of using four movements, with a dance movement inserted before the slow movement, as in Haydn's Piano sonatas No. 6 and No. 8. Mozart's sonatas would also be primarily in three movements. Of the works that Haydn labelled piano sonata, divertimento, or partita in Hob XIV, 7 are in two movements, 35 are in three movements, and 3 are in four movements; and there are several in three or four movements whose authenticity is listed as "doubtful." Composers such as Boccherini would publish sonatas for piano and obbligato instrument with an optional third movement – in Boccherini's case, 28 cello sonatas.
But increasingly instrumental works were laid out in four, not three movements, a practice seen first in string quartets and symphonies, and reaching the sonata proper in the early sonatas of Beethoven. However, two- and three-movement sonatas continued to be written throughout the Classical period: Beethoven's opus 102 pair has a two-movement C major sonata and a three-movement D major sonata.
The four-movement layout was by this point standard for the string quartet, and overwhelmingly the most common for the symphony. The usual order of the four movements was:
This four-movement layout came to be considered the standard for a sonata, and works without four movements, or with more than four, were increasingly felt to be exceptions; they were labelled as having movements "omitted," or had "extra" movements. Movements when they appeared out of this order would be described as "reversed", such as the Scherzo coming before the slow movement in Beethoven's 9th Symphony. This usage would be noted by critics in the early 1800s, and it was codified into teaching soon thereafter.
It is difficult to overstate the importance of Beethoven's output of sonatas: 32 piano sonatas, plus sonatas for cello and piano and violin and piano, forming a large body of music which would over time increasingly be thought essential for any serious instrumentalist to master.
Among works expressly labelled sonata, some of the most famous were composed in this era. Among piano sonatas alone, there are the three of Frédéric Chopin, those of Felix Mendelssohn, the three of Robert Schumann, Franz Liszt's Sonata in B Minor, and later the sonatas of Johannes Brahms and Sergei Rachmaninoff.
In the early 19th century the sonata form was rigorously defined, from a combination of previous practice and the works of important Classical composers, particularly Haydn, Mozart, Beethoven, but composers such as Clementi also. Works not explicitly labelled sonata were nevertheless felt to be an expression of the same governing structural practice. Because the word became definitively attached to an entire concept of musical layout, the differences in Classical practice began to be seen as important to classify and explain. It is during this period that the differences between the three- and the four-movement layouts became a subject of commentary, with emphasis on the concerto being laid out in three movements, and the symphony in four. Many thought that the four movement form was the superior layout. The concerto form was thought to be Italianate, while the four-movement form's predominance was ascribed to Haydn, and was considered German.
The importance of the sonata in the clash between Brahmsians and Wagnerians is also of note. Brahms represented, to his advocates, adherence to the form as it was strictly construed, while Wagner and Liszt claimed to have transcended the Procrustean nature of its outline. For example Ernest Newman wrote, in the essay Brahms and the Serpent: 
This view, that the sonata is truly only at home in the Classical style, and had become a road block to later musical development, is one that has been held at various times by composers and musicologists, including recently by Charles Rosen. In this view the sonata called for no explicit analysis in Haydn, Mozart, and Beethoven's era, in the same sense that Bach "knew" what a fugue was and how to compose one, whereas later composers were bound by an "academic" sense of form that was not well suited to the Romantic era's more frequent and more rapid modulations.
The piano sonatas of Scriabin would begin from standard forms of the late Romantic period, but would progressively abandon the formal markers that had been taught, and would usually be composed as single-movement works; he is sometimes thought of as a composer on the boundary between Romantic and modern practice of the sonata.
Charles Ives's massive Concord Sonata (1920) for piano bore little resemblance to the traditional Sonata. It had four movements (though not with the usual tempos), very few barlines, and the tonality, where present, is fleeting or often compounded with polytonality. It even contained optional (and very minor) parts for viola and flute.
Still later, Pierre Boulez would compose three sonatas in the early 1950s, which, while they were neither tonal nor laid out in the standard four-movement form, were intended to have the same significance as sonatas. Elliot Carter began his transition from neo-classical composer to avant-garde with his Cello Sonata.
The development of the classical style and its norms of composition formed the basis for much of the music theory of the 19th and 20th centuries. As an overarching formal principle, sonata was accorded the same central status as Baroque fugue; and generations of composers, instrumentalists, and audiences were guided by this understanding of sonata as an enduring and dominant principle in Western music. The sonata idea begins before the term had taken on its present importance, along with the evolution of the Classical period's changing norms. The reasons for these changes, and how they relate to the evolving sense of a new formal order in music, is a matter to which research is devoted. Some common factors which were pointed to include: the shift of focus from vocal music to instrumental music; changes in performance practice, including the loss of the continuo and the playing of all movements of a work straight through, without "mechanical" repeats; the shift away from the idea that each movement should express one dominant emotion (see Affekt), to a notion of accommodating contrasting themes and sections in an integrated whole; the move from a polyphonic mode of composition to a homophonic mode; changes in the availability of instruments, and new technical developments in instruments; the obsolescence of straightforward binary organization of movements; the rise of more dance rhythms; and changes in patronage and presentation.
Crucial to most interpretations of the sonata form is the idea of a tonal center; and, as the Grove Concise Dictionary of Music puts it: "The main form of the group embodying the 'sonata principle', the most important principle of musical structure from the Classical period to the 20th century: that material first stated in a complementary key be restated in the home key."
The sonata idea has been thoroughly explored by William Newman in his monumental three-volume work Sonata in the Classic Era (A History of the Sonata Idea), begun in the 1950s and published in what has become the standard edition of all three volumes in 1972. He notes that according to his research, theorists had generally shown "a hazy recognition of 'sonata form' during the Classical Era and up to the late 1830s" and places particular emphasis on Reicha's 1826 work describing the "fully developed binary form", for its fixing of key relationships, Czerny's 1837 note in the preface to his Opus 600, and Adolf Bernhard Marx, who in 1845 wrote a long treatise on sonata form. Up until this point, Newman argues, the definitions available were quite imprecise, requiring only instrumental character and contrasting character of movements.
William Newman also notes, however, that these codifications were in response to a growing understanding that the 18th century did have a formal organization of music. Before those publications of Reicha, Czerny, or Marx, there are references to the "customary sonata form", and in particular to the organization of the first movement of sonatas and related works. He documents the evolution of sonata analysis as well, showing that early critical works on sonatas, with some very notable exceptions, dealt with structural and technical details only loosely. Instead, many important works belonging to the sonata genre, or in sonata form, were not analyzed comprehensively in terms of their thematic and harmonic resources until the 20th century.
Heinrich Schenker argued that there was an Urlinie or basic tonal melody, and a basic bass figuration. He held that when these two were present, there was basic structure, and that the sonata represented this basic structure in a whole work with a process known as interruption. Arnold Schoenberg advanced the theory of monotonality, according to which a single work should be played as if in one key, even if movements were in different keys, and that the capable composer would reference everything in a work to a single tonic triad.
For Schenker, tonal function was the essential defining characteristic of comprehensible structure in music, and his definition of the sonata form rested, not on themes groups or sections, but on the basic interplay between the different "layers" of a composition. For Schoenberg, tonality was not essential to comprehensibility, but he accorded similar importance to the structural role of notes, in "explaining" the relationships of chords and counterpoint in musical structure. Both theorists held that tonality, and hence sonata structure in tonal form, is essentially hierarchical: what is immediately audible is subordinate to large-scale movements of harmony. They argued that transient chords and events are less significant than movement between certain crucial underlying chords.
As a practical matter, Schenker applied his ideas to the editing of the piano sonatas of Beethoven, using original manuscripts and his own theories to "correct" the available sources. The basic procedure was the use of tonal theory to infer meaning from available sources as part of the critical process, even to the extent of completing works left unfinished by their composers. While many of these changes were and are controversial, that procedure has a central role today in music theory, and is an essential part of the theory of sonata structure as taught in most music schools.
''For a more comprehensive list of sonatas, see List of sonatas.