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

On July 5, Ozzy performed his final concert — titled “Back to the Beginning” — with his band Black Sabbath. It was the first time the singer had reunited with the group in 20 years.

The "School of Rock" alum was joined by a band of teenagers, including Tom Morello's so on guitar and Scott Ian's son on bass.