I know it's going to sound really lame, but I don't usually listen to music during workouts, or ever... Occasionally I get the urge to listen to music, but not normally.

I listen to audio books most of the time, whether I'm driving in my car, walking to class or spending an hour on the elliptical. Right now I'm listening to "Song of Susannah" -- a Stephen King book in the "Dark Tower" series.

When I'm taking a cardio class, on the other hand--I like that there's music to get my blood pumping. But any semi-mindless activity during which my mind would usually wander (driving, walking to class, using machines at the gym...), I like listening to audio books.