I don't really suggest playing music while riding a bike. It can add a distraction to your concentration particularly when you are riding on a busy road. I usually listen to music in my various activities to add a boost in my mood but I don't see it as applicable in my bike riding habit. When you are in a road, you are in a very crucial place and more prone to unpredictable accidents. So, it's better not to add any distraction to your focus particulary to your ears. You need set your extreme full muti-senses concentration.