Sonata rondo form

Sonata rondo form is a musical form often used during the Classical music era. As the name implies, it is a blend of sonata form and rondo form.

An explanation of sonata rondo form requires first some preliminary coverage of rondo form and sonata form.

Rondo form involves the repeated use of a theme, set in the tonic key, with episodes, each involving a new theme, intervening among the repetitions, like this:

Sometimes the A section is varied slightly. The episodes (B, C, D, etc.) are normally in a different key from the tonic.

A sonata form movement is divided into sections.

It may begin with an introduction, which is commonly slower than the remainder of the movement. The first compulsory section is the exposition, whose purpose is to present the movement's main thematic material. This takes the form of one or two themes or theme groups, the second of which is commonly in a related key. This is often the dominant in major-key movements, or the relative major in minor-key movements. The two groups are linked via a modulating transition, or bridge, passage. The exposition may conclude with a short codetta and/or closing theme, and may be repeated. In the succeeding development section, existing thematic material may be presented in new harmonic and textural contexts, and/or entirely new material may be introduced. The development transitions into the recapitulation, where all themes or theme groups from the exposition are now presented in the tonic key.

In the notation, a single prime (') means "in the dominant" and a double prime (") means "in remote keys".

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