No, I have headsets and would rather listen for enemy footsteps and noises than music as it can be destracting. Plenty of time to listen to music after though.

I'm with sworndeath on this one. Listening to music (with headphones) while I'm playing MW3 actually messes me up. I'm no sound whore, but I still do worse if I can't hear what's going on in the game.

I do on ocasion when I'm feeling frisky and couldn't care less whether or not I die.  Otherwise, I almost always play with the headset.  Keeps the house quite for the Mrs and I find it more enjoyable.