Geezer Butler honored Ozzy Osbourne with a moving tribute, reflecting on their early days, lifelong bond, and emotional final show in Birmingham.

He might be famous as Guns N' Roses punk bassist, but Duff McKagan has always professed a love for music in many forms, with a longstanding relationship to both Sabbath and Ozzy Osbourne, even playing on the latter's last two albums.

I am so privileged to have spent most of my life with him," Terence “Geezer” Butler said of his late bandmate and friend

"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.

Osbourne, who battled Parkinson’s before his death, sat onstage in a black leather chair as he performed for the 42,000-person crowd. He sang five songs by himself, before he was joined by his former bandmates for four Black Sabbath songs.

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