incidental music

n. background music used in a movie or play

Incidental music is music in a play, television program, radio program, video game or some other form not primarily musical. The term is less frequently applied to film music, with such music being referred to instead as the "film score" or "soundtrack".Incidental music is often "background" music, and adds atmosphere to the action. It may also include pieces which will provide the main interest for the audience, for example overtures, or music played during scene changes. It may also be required in plays which have musicians performing on-stage.The use of incidental music dates back at least as far as Greek drama. A number of classical composers have written incidental music for various plays, with the more famous examples including Ludwig van Beethoven's Egmont music, Franz Schubert's Rosamunde music, Felix Mendelssohn's music for A Midsummer Night's Dream , Georges Bizet's music for L'Arlesienne, and Edvard Grieg's music for Henrik Ibsen's Peer Gynt. Parts of all of these are often performed in concerts outside the context of the play.
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Noun
1. music composed to accompany the action of a drama or to fill intervals between scenes
(hypernym) composition, paper, report, theme

incidental music /,insi'dentl'mju:zik/
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