Changes

===Development===

===Development===

The development often begins in the same key as the end of the exposition, but modulates through many different keys until the recapitulation. In this section, the themes laid out in the exposition are modified through key changes, breaking down parts of keys and motifs, variations in rhythm and harmony, and other ways.

The development tends to be the most unstable section of the work. Harmonically, the music proceeds through many different keys, some quite far-removed. Thematically, this section also tends to be unstable: breaking down the material presented in the exposition, splintering it into its constituent motives, essentially presenting familiar material in novel ways.

The end of the development is the retransition, in which the original key of the sonata is increasingly stressed as the recapitulation is approached.

At the end of the development, the harmonic and thematic instability begins to normalize as the return of the main theme in the tonic key is prepared. This can lead up to a dramatic arrival (as is typical in Beethoven), or simply relax the tension and segue gently (characteristic of Mozart), or end in a humorous pause (quite often in Haydn).

===Recapitulation===

===Recapitulation===