I think what your talking about is the "Film Score"

http://en.wikipedia.org/wiki/Film_score
"A film score is a broad term referring to the music in a film, which is generally categorically separated from songs used within a film. The term soundtrack is often confused with film score, though a soundtrack may also include songs featured in the film as well as previously released music by other artists, while the score does not. A score is written specifically to accompany a film, by the original film's composer(s)."

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