Changes

The sonata form as it developed in late-18th-century central Europe is based on a large-scale plan involving a modulation, or change of [[key (music)|key]], away from the main key of the work. At the end of the exposition, the music modulates to a second key and finishes off with a decisive cadence. However, in the classic period composers considered it unacceptable to end a work in a different key than which it had begun, so the second half of the movement would represent a dramatic attempt to modulate back to the original key.

The sonata form as it developed in late-18th-century central Europe is based on a large-scale plan involving a modulation, or change of [[key (music)|key]], away from the main key of the work. At the end of the exposition, the music modulates to a second key and finishes off with a decisive cadence. However, in the classic period composers considered it unacceptable to end a work in a different key than which it had begun, so the second half of the movement would represent a dramatic attempt to modulate back to the original key.

While the terms "exposition," "development," and "recapitulation" are useful for defining the typical structure of a sonata movement, composers did not use this terminology.

While the terms "exposition," "development," and "recapitulation" are useful for defining the typical structure of a sonata movement, the composers themselves did not think in these terms.

===Introduction===

===Introduction===