Sitting next to someone listening to their iPod looudly is annoying but I can put up with it. But sitting on a bus, or tube, next to someone who is listening to their mp3s on their phone without headphones I cannot handle. There is worse though. Once, I had the pleasure of sitting in front of someone who decided to sing along with their music. Sadly they only had two tracks, Celine Dion's Titanic horror, and End of the Road by Boyz II Men.
There is hope though, an online campaign and petition has been started for Music Free Buses which is certainly worthy of support, if not simply to stop that inevitable first "mp3 bus rage" incident.