OSTs are great sometimes, but I like playing my own music sometimes if I find things that fit the game. I love listening to The Protomen while playing Red Dead Redemption, which may sound odd being how they make music about Megaman, but the western style music fits great. Also, the Velvet Underground is beautiful during Super Meat Boy-relaxing and smooth in contrast to, well, Super Meat Boy. What about you guys? Any good combinations you've found?