im not sure what you mean.Are you after the ingame music from games say like the music played in halo or grand tehft auto ?
i know you cant extract the audio files from teh xbox 1 games if you have a modded unit but im not sure how you get them from the newer consoles but im sure somone will have if thats what your after
Some games have fan forums.
When I indulged in 'such like' I remember downloading some ingame music.
I recall I downloaded Stronghold themes.
That site for gamers was heavengames.com.