Definitions for "Incidental Music"
music written for plays or other dramatic works. The music helps to create an atmosphere or mood. Incidental music is often used as background music and is played during and between scenes. [ALR
music that is written for a stag play, consisting of dances, marches, etc., to be played during scenes, or short introductions and postludes to be played before and after each scene.
Music which accompanies a film or play.