"Now the band is both here and not here; with us, and yet gone," the Smashing Pumpkins frontman wrote on Instagram

Iommi also explained that the band only agreed to reunite for the Back to the Beginning concert because it would be a charity show. "It’s absolutely the end,” he said of Black Sabbath, which he formed in 1968 with Osbourne, Butler, and Ward. “There’s no way we could go out and do a tour.”

Black Sabbath ’s classic lineup — Ozzy Osbourne, Tony Iommi, Geezer Butler and Bill Ward — staged a triumphant hometown reunion at Saturday's Back to the Beginning concert, delivering a four-song setlist that marked their first performance together in two decades.