My wife could not be a rock star...
She is hot and has a great voice...and I mean really hot; she gets a lot of looks everywhere we go.  Sometimes, it kinda gets to me, because I myself being a guy, know what other guys are think about MY wife.
But I don't think she'd cut it as a rockstar on the whole...she's too tall (about 5'11), and does not have the personality for it.  She just doesn't care about fame or money even...and she's not provocative or outgoing.  She has a lot of confidence but is really rather quite acept with good friends.
She's into Various modes and forms of chant: Gregorian chant, Byzantine chant, and then later motet pieces derived from early chant...and frankly, she's really good at it, so she does get opportunities to sing professionally and she'll get more and more of them as she get even better.  Opera is an outside possibility, but probably not.
On the whole, I better keep my day job.
Edit to add words that I left out.