What+is+Sonata+Form?+-+Holly+Kozlik

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Sonata form is a structure of music used by various artists during the Classical period. This structure consists of 3-5 movements, //ABA//.
 * The first A section is called the "Exposition."
 * The B section is called the "Development".
 * The last A' section is called the "Recapitulation".

Section A is normally in the tonic key and is fast in tempo. Themes can be represented in this section and there can be multiple themes.
 * Exposition **

Section B is in dominant or relative major key. Themes are developed in this section by the composer
 * Development **

This section is very similar to the Exposition with the exception of minor changes and is always played in the original key, most commonly, tonic key.
 * Recapitulation **