Radio music (Q-Radio). Stuff from the hitlists. Most of it sucks, but it doesn't really bother me. I prefer to have a more acute sense of my environment and the motion of my body when I workout.
I only really need music when I'm doing cardio.
Ditto.
On top of that I just can't stand the "claustrophobic" feeling I have when I'm wearing headphones and I have wires attached to me. I feel too restricted.