I've blogged before about my struggles finding the appropriate music for my iPod when I run.
I've tried fast, slow, old, new, aggressive, subtle, live songs, studio songs, trash and classics. I can't settle on any one thing. (The real problem is I'm slow and in my 40s. Cry for me, please...)
Anyway, there is a great story in the NY Times today about this exact thing -- what music to work out with. After reading it, I've found out that I don't run to enough dance or hip-hop, but that's another conversation entirely.
Read it here.