
Incidental music is music in a play, television program, radio program, video game, film 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 is intended to add atmosph...
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http://en.wikipedia.org/wiki/Incidental_music

Usually found in film and TV scores, incidental music is the stuff that happens in the background to give that particular scene you are watching an added emotional or atmospheric flavour.
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http://www.bbc.co.uk/radio2/soldonsong/glossary/i.shtml

music written to accompany or point up the action or mood of a dramatic performance on stage, film, radio, television, or recording; to serve as a ... [3 related articles]
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http://www.britannica.com/eb/a-z/i/15

Music supplementing a spoken drama such as music composed for a play. Incidental music could be introducing a play (such as an overture), between acts (an interlude), or as a supplement to spoken parts or dramatic elements.
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http://www.violinonline.com/glossary.htm

[
n] - music composed to accompany the action of a drama or to fill intervals between scenes
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http://www.webdictionary.co.uk/definition.php?query=incidental%20music

Music either specifically composed for, or used in, a drama.
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https://www.encyclo.co.uk/local/20508
noun music composed to accompany the action of a drama or to fill intervals between scenes
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https://www.encyclo.co.uk/local/20974

music composed for atmospheric effect or to accompany the action in a predominantly spoken play; the music is not integral to the work even though it may have dramatic significance.
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https://www.encyclo.co.uk/local/21784

music intended primarily to point up or accompany parts of the action of a play or to serve as transitional material between scenes.
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https://www.infoplease.com/dictionary/incidental-music
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