I like that Witcher 2 music. I never played Opposing Force either, but I know that Black Mesa: Source has some extremely nice music. https://www.youtube.com/watch?v=A0kgj1cE20A&index=1&list=PL5372E0F5F9868993 I especially like Blast Pit 2, Blast Pit 3, Forget About Freeman, Questionable Ethics 1, Surface Tension 2, Theme Song, and We've Got Hostiles. Sometimes I just sit and listen to the music, and do nothing else than just digging it. Just listening to the music has made me want to replay the whole game, and I didn't even like it that much. The music is just so epic that I have to experience it in the game. Absolutely great playlist, you should listen to it, or at least the songs I mentioned!