What term describes a musical form where a main theme returns in the course of a composition in a recurring manner?

• A. Ritornello
• B. Ostinato
• C. Sonata form
• D. Theme and variations

Answer: (A)

Ritornello form centers on a main theme that keeps returning throughout the piece, often between contrasting episodes. In a Baroque context, this recurring refrain (the ritornello) is heard again in full or in fragments, usually in the home key, creating a recognizable anchor as the music moves through contrasting middle sections. The term itself means "little return," highlighting this repeating structure.

Ostinato, by contrast, is mainly about a repeating figure or pattern that underpins the music rather than a formal return of a complete theme. Sonata form is a broader structure focused on how two or more themes are introduced, developed, and recapitulated, not specifically about a recurring refrain. Theme and variations centers on repeating a theme while varying its presentation, rather than interleaving a recurring main theme across sections.