soundtrack

ääniraita A narrow strip running down a movie film that carries the recorded sound in synchronization with the pictures.
The sound (especially the music) component of a movie, video game, etc.
A recording of such music for sale.
Background sounds that are part of a bigger event.
August 16 2014, Daniel Taylor, "http://www.theguardian.com/football/2014/aug/16/manchester-united-swansea-city-premier-league-match-report Swansea upstage Manchester United in Louis van Gaal’s Premier League bow," guardian.co.uk:

There was a startling lack of creativity and if Van Gaal had listened closely he would have made out the mocking chants from the away end, as the visiting fans embarked on the repertoire of songs that formed the soundtrack to David Moyes’s time in the job.