Which musical form features a principal theme that returns after contrasting sections, often in patterns such as ABACADA?

• A. Ternary form
• B. Binary form
• C. Sonata form
• D. Rondo

Answer: (D)

Rondo form features a recurring main theme that returns after contrasting sections, giving the movement a unifying refrain. The pattern ABACADA shows how the A theme keeps reappearing between episodes (the B, C, D sections), providing contrast each time. This differs from binary form, which presents two sections (A and B) with no repeated return of A after multiple contrasts, and from ternary form, which typically presents A–B–A with a single return of the initial theme. Sonata form centers on development and recapitulation of motives rather than a repeated formal refrain.