OH some people are just so scared when they ride a bike...

Heck yeah I use my MP3 Player (Ipod Shuffle). I use it at volumes that allow me to hear what is going on around me. The benefits far out weigh the perceived risks. I know a few people that have been hit by cars, attacked by dogs... no MP3 player on them. I don't see how not wearing one helps you avoid anything.

If it helps you put in many miles on the bike... GO FOR IT!