In truth, Angela was all three, though she'd never been the screaming and fainting sort of fan. Except about history. If she ever met the author of Hogwarts a History she'd probably scream, faint, and then offer to bear his children, but that would be a rare circumstance indeed. Musicians mostly existed to entertain her, like most of the world, but they were simply more honest about it.
She wouldn't even have recognized him at all if it hadn't been for the screaming.
"A whim," She answered honestly and with a small laugh, "And because I feel it's my obligation to support good taste in drinks and fashion. Both are sorely lacking in the world."