Most of the time I listen to music it's either the radio or classical music in the car. I like really heavy metal but my wife hates it, and most of the music she likes sounds like cats wailing to me. So generally we listen to a limited subset of our music collection unless the other is out.
In the car I like classical because I find it soothing background music. I don't tend to listen to heavy metal when driving because I've found I drive faster. Not dangerously fast, but faster than I really need to be going. So it seems the easiest solution is to just leave it switched off.