I use to run quite a bit, and you would never catch me running without music. I heard I needed to make sure before I rode with my Ipod, but I don't know where to look.
Anybody listen to music while they ride? Anybody know the law, if there is one?

Nothing I could find in the Texas Transportation Code ( http://www.capitol.state.tx.us/statutes/tn.toc.htm ) prohibits the use of headphones while operating a vehicle. I ride with headphones all the time and have never been hassled by the man for it.