I usually don't really listen to anything while I am gaming. Especially when I am playing games on armor games, I mute the sound. But if it is a game on the console I might listen to the sound in the game.
Whenever I'm gaming I have an iTunes playlist of a bunch of different songs. I listen to a little Hamemrfall, Jackson 5, Daughtry, Hinder, Aerosmith and Kanye West. I know it's a weird combonation of artists but I just like all of their music so i put them all on the same playlist.