Help Adding Music

[ebola13]

I know how to add custom sounds to the game, they work fine, but when i add music the same way, it is very quiet and when you run the sound keeps jumping between left and right ear. The quality is really bad. I tried adding edited zmb_mus so it loads my songs, but the mod doesnt see them when it is buiding.

So my question is how can I add custom songs to the game?!