How would you describe a motif vs a theme?

• A. A motif is a short idea; a theme is a longer, complete idea.
• B. A motif is longer than a theme and more developed.
• C. They are always identical in length.
• D. A motif is always sung, a theme is always instrumental.

Answer: (A)

The idea being tested is how a motif and a theme differ in music. A motif is a short musical idea—a tiny building block like a distinctive rhythm or a short melodic fragment that repeats to give unity to a piece. A theme, by contrast, is a longer, more complete musical idea—a melody or subject that could stand on its own as a tune and often carries the main material of a section or movement. So describing a motif as a short idea and a theme as a longer, complete idea fits how composers actually use them: motifs provide recurring texture and coherence, while themes provide the broader melodic statement of the piece. The other statements don’t fit because motifs aren’t longer than themes, and length varies; also motifs aren’t confined to vocal or instrumental—either can present a motif or a theme.