Assertion: concerto's key | /r/ObjectUse | used called development
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text: The standard sonata allegro form is; themeA in main key, theme B in different key, A & B repeated (this is called the exposition), a "jam" on the themes A & B, avoiding the keys used (called development), then theme A in original key, theme B in same key as A (called recapitulation), then comes the coda (gives the feeling of ending) which for balance, frequently uses material from the development.