I'd be surprised if Heaven & Hell was closing the show. Priest have sold more records and have had more exposure than the Dio incarnation of Sabbath. I'd say more average fans know "You Got Another Thing Comin" and "Breaking The Law" than "Neon Knights" or "Mob Rules"
I listened to three Babymetal tracks...sounds like Chun Li getting butt-fucked by Andrew W.K. That's not something I ever wanted to hear.