There is no way I can workout without music. I have three main playlists. The first is electro, dubstep, pop, upbeat rap...anything that pumps me up for cardio. Tons of Deadmau5, Yeasayer, Kanye, Jamiroquai. The second is rap (especially Southern rap) that makes me feel invincible while lifting weights. That one is mostly Three 6 Mafia, Lil' Boosie, Webbie, Young Jeezy, etc. The third is really chill music to stretch to...trying to get my splits back. So Bon Iver, The Weepies, Manu Chao.
I've gone to the gym to realize my iPhone is dead, forgot headphones, etc. I've turned right back home...the only time I don't listen to music is if I'm running a race (and even then I have songs "playing" inside my head to keep me pumped).
What can I say, I love music.