Rock/Metal Long songs like 2112,Hemispheres by Rush or Dark Side of the Moon, or other long songs by Pink Floyd since gaming takes up very,very much time.
I prefer the game's music - its more immersive for me becasue i play games like metro and witcher, crysis and such. If its MP i dont bother- i like to get immersed
i didn't ever think much of music to a game (i prefer the sound effects more) but i was playing online the other day and they had an eminem track moded into the game.
i actually enjoyed it.
I do like the music in Half life 2 Episode 2 when the vorigaunts got to perform the larval extract and all the antlions start coming in from all directions !
That was one of my most favorite parts of any video game I've played and the music was just perfect for at that time.