While I agree with what you are saying (we need to respect eachother) I personally feel that riding a bike (especially on roads) requires you to pay 100% attention to your surroundings. You have to look and listen for cars, because as we all know we can't expect them to notice us. Listening to music takes away from your ability to hear cars, as well as your abilty to react fast. If you are actually listening to the music, your brain cannot process that cat that ran out in front of you as fast...because its too busy telling you to sing along.

In short... music = imminent death. Don't be a statistic.

Listen to your music on the trainer, or at the gym...but not on the street.