Ternary form is a musical structure that consists of three sections, typically labeled as A-B-A. In this arrangement, the first section (A) presents a theme, the second section (B) offers a contrasting theme, and the final section (A) returns to the original theme, often with variations. This form is significant as it showcases contrast and return, which are foundational concepts in music, especially during periods of developing tonality and functional harmony, as well as in the construction of suites and overtures.
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