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sonata, type of musical composition, usually for a solo instrument or a small instrumental ensemble, that typically consists of two to four movements, or sections, each in a related key but with a unique musical character. Deriving from the past participle of the Italian verb sonare, “to sound,” the term sonata originally denoted a composition played on instruments, as opposed to one that was cantata, or “sung,” by voices. Its first such use was in...