I think every film actor secretly wants to be a rock star as well; just that part of the job which requires the extrovert in you. Even if you've become an actor because it's your way of hiding in plain sight, there's still part of you which has that craving.
Historically, musicians know what it is like to be outside the norm - walking the high wire without a safety net. Our experience is not so different from those who march to the beat of different drummers.