Black Sabbath bassist Geezer Butler shared memories of Ozzy Osbourne's final performance before the rock legend's death at 76, reflecting on their 57-year friendship.

"I didn’t realize then that I would never see Ozzy again after that night," Butler writes of the July 5 "Back to the Beginning" show in England.

Just weeks after the curtains closed on the pioneering rock band’s final gig together, frontman Osbourne died at age 76 on July 22. Now, in an essay for The Sunday Times, the bassist, 76, pulled back the curtain on his “57 incredible years of friendship” with Osbourne — from the band’s formation to its farewell concert.

In an emotional essay, Geezer Butler recalled his decades-long friendship with Ozzy Osbourne and Black Sabbath's final rehearsals.

The late Black Sabbath vocalist suddenly died just weeks after he made his final on-stage appearance with the band.

On Thursday, July 24, the alt-rock musician — whose real name is Dominic Harrison — shared an Instagram post where he revealed his plans to play Black Sabbath's 1972 track "Changes" each night "for the rest of my life" following the rock icon's death on Tuesday, July 22 at age 76.

Kelly Osbourne is mourning the loss of her father Ozzy following his death on Tuesday, referencing lyrics from Black Sabbath’s “Changes.” Osbourne posted the brief message to her Instagram stories on Thursday afternoon.

Born John Michael Osbourne, the English musician rose to fame as the so-called Prince of Darkness with his heavy metal band, Black Sabbath, which he co-founded in 1968. The band released popular hits like “Paranoid,” “Iron Man” and “War Pigs.”