Which form is described as monothematic, with a single subject repeated through imitations and development?

• A. Rondo form
• B. Theme and Variations
• C. Sonata form
• D. Fugue form

Answer: (D)

The idea being tested is how a single musical idea can travel through an entire texture by imitation in different voices and by development. In a fugue, one subject is presented and then immediately echoed in other voices, creating a web of entrances that imitate and answer each other. As the piece progresses, those entrances are developed—the subject may appear in different keys, be inverted or augmented, and interweave with episodes that treat the material in new ways. This keeps a single theme at the center while it is transformed and explored through the texture.

This distinguishes it from rondo, which centers on a recurring refrain that returns between contrasting episodes but doesn’t typically involve continuous, imitative treatment of one subject across multiple voices. Theme and Variations keep the same idea but alter it in various ways rather than building a multi-voice, imitative dialogue. Sonata form uses more than one theme and moves through exposition, development, and recapitulation, so it isn’t centered on a single subject repeated in imitation.