I know this question was asked many times before, yet I can't find the solution. I tried to use one of the tracks for portal 1 in portal 2. Used the 3kliksphilip's tutorial for source custom sounds. The track does play in hammer, yet does not play in game. It's in the sounds/music folder. Any suggestions?

Both .wav and mp3 files won't do it

P.S. Topic #4000

EDIT: Nvm, got it working xD