Wild track/wild sound

A film soundtrack recorded for motion picture where the audio elements are not recorded in sync with the picture. Wild tracks are frequently used to get a clean recording of dialog that was otherwise unobtainable because of noise on the set. Typical examples of wild tracks in film would be narration, phone conversations, and answering machine messages playing back in a scene. Wild tracks can also be musical as well. For example, a song played in the background that serves as a kind of narration or creates atmosphere.