I think it's dangerous to listen to music while riding. tribogota just wrote a perfect example of the reasons why. I find that if I'm going along at a good pace with the wind in my ears I can hardly hear traffic behind me as it is, nevemind having the distraction of music as well.
I do listen to music a lot on the turbo trainer and while travelling by foot safely on the pavement. I like bands such as Linkin Park, Papa Roach & Evanesence. I also like quieter stuff depending on my mood. I still enjoy Abba, Bob Marley, country music and classical music. so I like quite a wide range.