
Background music refers to various styles of music or soundscapes primarily intended to be passively listened to. It is not meant to be the main focus of an audience, but rather to supplement that which is meant to be focused upon. Music that is played at a low volume and is not the main focus of an audience is also referred to as background music...
Found on
http://en.wikipedia.org/wiki/Background_music

When an audience is viewing a film, music is often heard in the background to accompany the action. The source of these sounds does not emanate from the setting in the film, ordinarily, but is used to enhance the mood, emotion, and visual images given a specific scene. Scores are written for films and include the complete body of music; however, ba...
Found on
http://www.allmovie.com/glossary/term/background+music
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