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The sonata form (also sonata-allegro form or first movement form) is a musical structure generally consisting of three main sections: an exposition, a development, and a recapitulation. It has been used widely since the middle of the 18th century (the early Classical period ).
Sonata form is one of the most influential ideas in the history of Western classical music.Since the establishment of the practice by composers like C.P.E. Bach, Haydn, Mozart, Beethoven, and Schubert and the codification of this practice into teaching and theory, the practice of writing works in sonata form has changed considerably.
In music, the three-key exposition is a particular kind of exposition used in sonata form. Normally, a sonata form exposition has two main key areas. The first asserts the primary key of the piece, that is, the tonic. The second section moves to a different key, establishes that key firmly, arriving ultimately at a cadence in that key.
In the field of music theory, the term Sonata Cycle refers to the layout of a multi-movement work where the movements are recognizably in the forms of the tradition of classical music. It differs from the term cyclic form in that there is no unifying motive or theme used in all the movements. The standard sonata cycle has four movements, broken ...
The term is most widely used [4] as an analytical convenience to denote a portion of a movement identified as an example of classical tonal sonata form. The exposition typically establishes the music's tonic key, and then modulates to, and ends in, the dominant. [5] If the exposition starts in a minor key, it typically modulates to the relative ...
Sonata Theory understands the rhetorical layout of a sonata as progressing through a set of action spaces and moments of "structural punctuation." [8] These action spaces largely correlate with the "themes" or "groups" of the sonata, though each space is differentiated primarily by the unique generic goal that the music pursues within that particular space.
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 ...
A notable source of confusion is the term 'sonata': as a genre, it denotes a multi-movement composition for one or more solo instruments, while in structural terms, 'sonata form' refers to a specific three-part structure (exposition, development, recapitulation) frequently used within individual movements of larger works.