In rounded binary form, the B section must be contrasting.

In rounded binary form, the B section must be contrasting.

• A. Rounded binary form
• B. Simple binary form
• C. Ternary form
• D. Rondo form

Answer: (A)

In rounded binary form, the middle B section is the contrasting portion that sets up the return to familiar material. This contrast can be in melody, harmony, key, or mood, giving the listener a sense of departure from the opening material. The return to the A material isn’t a full repetition but rather a partial restatement that brings the movement to a cohesive close. This contrast before the return is what characterizes rounded binary and distinguishes it from simple binary (which lacks that returning sense) and from ternary (which presents a full recapitulation of A in the final section).

In rounded binary form, the middle B section is the contrasting portion that sets up the return to familiar material. This contrast can be in melody, harmony, key, or mood, giving the listener a sense of departure from the opening material. The return to the A material isn’t a full repetition but rather a partial restatement that brings the movement to a cohesive close. This contrast before the return is what characterizes rounded binary and distinguishes it from simple binary (which lacks that returning sense) and from ternary (which presents a full recapitulation of A in the final section).