What do you listen to when you're all alone in the car? What would you never want your friends to hear you singing?

Today I was rollin' down the highway screaming along to MEATLOAF: Bat Out Of Hell. That album is over 40 years old and I know every word to it. Here's the funny/sad part, I'm 27 years old and I've never met a soul besides myself who knows more than one MEATLOAF song. I know the whole album.

So what's your guilty pleasure music?