Lots of counties do precisely that, and for exactly that reason. And, as others have noted, it's likely to reduce the talking-on-cellphone, which studies have shown is just as distracting and likely to cause an accident hands-free as holding the phone.

I don't think the villain is the music. I think the villain in this case is the distracted driving.

I for one listen to music at full blast and tend to drive spiritedly which requires full 110% concentration. So I would agree that there are bigger fish to fry than listening to music while driving. But I'm going to be honest and say I've seen folks who don't listen to music and do bonehead things on the road because they're distracted. So yes, let's bad roadside billboards. I'm with you on that.