The word "diva" thrown around awfully loosely these days. It gets applied to any broad willing to do anything to become a "celebrity". Anyway, I think the last true diva was Callas, the voice wasn't always great technically but what personality came through the singing!
I don't even know if she is alive still. She was definitely younger than Ari.
I also love musicals by Andrew Lloyd Weber. But, again, it's a no around here unless Cyber's not around.
He has really good taste in music, but I think my taste is more varied.