Which form is binary and features a returning tonic material in the second section?

• A. Binary Form
• B. Rounded Binary Form
• C. Ternary Form
• D. Through-composed Form

Answer: (B)

Rounded binary form is the pattern where the piece starts with an idea in the home key, moves into a contrasting second section, and then returns of the opening material toward the end of that second section to reestablish the tonic. That return gives a sense of closure, even though the overall form remains binary. This specific return of the initial material within the second section distinguishes it from plain binary (no return), ternary (a separate final restatement of the opening idea as a distinct third section), or through-composed (new material with no returning idea).