i listen to the sound of laughter because almost every game i play has some type of crazy kill or someone doing something that makes me laugh
Honestly, I would mute the game if I could but there are too many useful audio notifications - like someone getting juice, or an assassin. The problem is Micky Cantor, really.
I mute the game and listen to whatever is on my harddrive until I get grappled by a assassin then I get pissed I didn't hear her and turn of the music and turn back on game sounds.