Rocker Tom Morello is shedding light on Ozzy Osbourne’s final Black Sabbath show. The late metal god’s friend, 61, shared that Osbourne knew the Black Sabbath’s “Back to the Beginning” farewell concert on July 5 would be his last performance. The Prince of Darkness died at age 76 on July 22.

Ozzy plays a major role in the song's spacy, blissed-out sound, using a Leslie speaker to achieve the swirling, vibrational effect on his vocals. It was an effective vibe shift and remains one of his most unique performances.