Music composed, arranged and played specifically for the production.
Incidental music is often “background” music, and adds atmosphere to the action.
Theme music is a piece that is often written specifically for a radio program, television program, video game or movie, and usually played during the title sequence and/or end credits. If it is accompanied by lyrics, most often associated with the show, it is a theme song.
Short bursts of music to bind two sections together.
This is a musical genre that focuses largely on the characteristics of sounds, often organized or performed to evoke an ‘atmospheric’, ‘visual’ or ‘unobtrusive’ quality.