A prelude is a short piece of music, usually in no particular introduction to succeeding movements of a work that are usually longer and more complex. It generally features a single rhythmic and melodic motif that is used in every measure throughout the piece. Stylistically, the prelude is improvisatory in nature. The prelude can also refer to an overture, particularly to those seen in an opera or an oratorio.

The prelude can be thought of as a preface. It may stand on its own or introduce another work.