What defines a motet in the context of sacred music?

A motet is defined as a short piece of sacred choral music, typically characterized by its polyphonic texture and often performed unaccompanied. Historically, motets originated in the medieval period and evolved through the Renaissance, becoming a prominent form of sacred music. The intricate interweaving of vocal lines in a motet allows for expressive depth and complexity, often setting Latin texts that are liturgical or devotional in nature.

The emphasis on being both brief and polyphonic distinguishes motets from longer compositions and instrumental works. In contrast, other types of music mentioned—such as lengthy orchestral compositions or forms of secular opera—serve different purposes and structural characteristics that do not align with the motet's specific sacred choral tradition. Similarly, a solo vocal piece with accompaniment lacks the harmonic interplay and choral element that define a motet. Thus, identifying a motet as a brief, polyphonic work highlights its unique place in sacred music traditions.