I don't. BF does. He's got a set of headphones with just one ear bud (they were mine, I put a dresser down on the other one!)

I don't think he wears them when out with others but I'm pretty sure he likes music when he's doing a mtb race.

I sometimes wish I could - I'm not lucky enough to get full songs stuck in my head, usually just one line of a song I don't really know. It gets old after awhile!