Rockerboys and girls are entertainers - actors, writers, musicians, comedians, jugglers, what have you. Anyone that is a celebrity for who they are rather than what they do, is a Rockerboy. Anyone who is loved and worshipped out of all proportion to what they've done is at least in part a Rockerboy. Even if they'd rather not be, heh.
So you want to play the famous or would-be famous character that gets into bars and has fans and creates, manipulates or exploits multimedia for people to enjoy? You're a Rockerboy.
If you want the Story - for whatever reason, fame, money, power or God Forbid, Truth - you're a Media.