I would never want to listen to music on the slopes, for one I love the sound of being up in the mountains snowboarding, I can listen to music anytime. Secondly I think sound is an important part of your awareness when snowboarding, you can hear if you hit ice for example or hear the people around you. I have seen guys wearing earphones cut off people and not even know it cause theyre in their own world.
you definitely need to be more aware when listening to music, or this will happen. Always looking over your shoulder is vital.