no. It's dangerous.
can't hear cars coming, traffic, pedestrians etc. Anything which may give you those extra few seconds before you get into an accident may save you.
Not to mention while listening to music you lose focus.
But why?
I find riding a pleasure. Why would anybody who enjoys riding have to listen to music?
Listen to the sounds of the bike. Beats any music!
EDIT: I dont understand why so many people have voted yes. Next time you go for a ride, count how many people riding listen to music. Almost none I'll guarentee. Its almost 50/50 in the pole but its more like 1/99 on the streets. can anybody explain this?