Bassist Geezer Butler was interviewed by 107.7 RKR’s ”Rocker Morning Show” where he recalled Judas Priest’s Rob Halford performance with Black Sabbath from 2004 in Camden, New Jersey, the time when Ozzy Osbourne couldn’t perform.

Here’s what Butler recalled:

“It was great, Rob’s (Halford) from the same area as the four of us. And Tony (Iommi) actually used to manage the first version of Judas Priest. So we all knew each other from the early ’70s. And Rob knew all the lyrics to the Sabbath stuff.

”And when Ozzy got ill, Judas Priest were on the same bill as us, and we asked Rob if he wouldn’t mind coming on and filling in for Ozzy. He was a bit reluctant, in case he blew his voice out. But then he agreed. And it went great. […]

“Well, it started off not very well because everybody’s expecting Ozzy, and then there’s Rob Halford coming on. And then, after the first song, everybody accepted us. They didn’t really know what was going on.

”Why is Rob Halford singing with Black Sabbath instead of Ozzy? And then he explained everything after the first song. And then the audience got it. And (it was) a good gig after that.”