Songwriters have often penned odes to being hot for teacher. But in the '80s, the Police turned the tables with 'Don't Stand So Close to Me,' about a teacher who lusts after a student. That would have just been an interesting twist were it not for the fact that frontman Sting had actually been a teacher, leading to speculation that he was writing about himself. (He later said it was pure fiction.) As we honor Teacher Appreciation Month, here are 20 musicians who have also worked on the otehr side of the desk.