It's kinda weird, what I listen to...yeah, most of it is the to-be-expected heavy/hard stuff, but I sometimes listen to stuff that sure doesn't seen appropriate at first blush- I mean, who else would ever lift to Neil Diamond's "Sweet Caroline"?!? Or what about Fleetwood Mack's "Fireflies"?

Or Lucinda Williams (during grip work). I'll have stuff like that in rotation along with G 'n' R, Motorhead, AC/DC and the other typical fare.
Heavy sets on chest and back days: Bob Seger's "Get Out of Denver".
I don't play *any* tunes when doing legs...it somehow distracts me and I don't want to have an "oops" while squatting/etc. I have my best leg workouts with things nice and quiet (well, quiet except for any noises I might make

).
I absolutely *gotta* have good music videos going when I do my cardio, no way I'd make it through the tough intervals without it. I keep the VCR and DVD loaded and cued in case there's nothing good on the cable.