What is the primary function of a motive in music composition?

The primary function of a motive in music composition is to act as the smallest fragment of a theme. A motive is a short musical idea that can consist of a few notes and serves as a building block for longer musical phrases or themes. Composers often use motives to create cohesion within a piece, as they can be developed, varied, or repeated throughout a composition. This allows the motive to contribute to the thematic material and overall structure of the music. By manipulating motives, composers can evoke different emotions and maintain listener interest, enhancing the narrative of the piece.

Other options may relate to different aspects of music composition. While a motive can certainly serve as part of a theme, its primary identity is as a smaller unit rather than the complete thematic idea. Similarly, although motives can interact with harmony or contribute to lyrical passages, those functions are secondary to their role as fundamental fragments within the musical idea.