soundtrack
n. countable B1 Intermediate US //ˈsaʊnˌtɹæk// UK //sˈaʊndtɹæk// sound·track
n. the music that goes along with a movie, television show, or video game. You can listen to it on its own to remember your favorite scenes.
n. the recorded music accompanying and synchronised to the images of a motion picture, television program, or video game.
The movie has a beautiful piano soundtrack.
The director worked closely with the composer to ensure the soundtrack matched the dark mood of the film.
While the film's cinematography was widely panned, the orchestral soundtrack received critical acclaim for its ability to evoke deep emotional resonance in otherwise hollow scenes.
From sound + track.
Usage
Often used as a modifier before another noun, such as 'soundtrack album' or 'soundtrack composer'.