Passage: Following the completion of the Born Again tour in March 1984, vocalist Ian Gillan left Black Sabbath to re-join Deep Purple, which was reforming after a long hiatus. Bevan left at the same time, and Gillan remarked that he and Bevan were made to feel like "hired help" by Iommi. The band then recruited an unknown Los Angeles vocalist named David Donato and Ward once again rejoined the band. The new line-up wrote and rehearsed throughout 1984, and eventually recorded a demo with producer Bob Ezrin in October. Unhappy with the results, the band parted ways with Donato shortly after. Disillusioned with the band's revolving line-up, Ward left shortly after stating "This isn't Black Sabbath". Butler would quit Sabbath next in November 1984 to form a solo band. "When Ian Gillan took over that was the end of it for me," he said. "I thought it was just a joke and I just totally left. When we got together with Gillan it was not supposed to be a Black Sabbath album. After we had done the album we gave it to Warner Bros. and they said they were going to put it out as a Black Sabbath album and we didn't have a leg to stand on. I got really disillusioned with it and Gillan was really pissed off about it. That lasted one album and one tour and then that was it."Following both Ward's and Butler's exits, sole remaining original member Iommi put Sabbath on hiatus, and began work on a solo album with long-time Sabbath keyboardist Geoff Nicholls. While working on new material, the original Sabbath line-up agreed to a spot at Bob Geldof's Live Aid, performing at the Philadelphia show on 13 July 1985. This event – which also featured reunions of The Who and Led Zeppelin – marked the first time the original line-up had appeared on stage since 1978. "We were all drunk when we did Live Aid," recalled Geezer Butler, "but we'd all got drunk separately."Returning to his solo work, Iommi enlisted bassist Dave Spitz (ex-Great White), drummer Eric Singer and initially intended to use multiple singers, including Rob Halford of Judas...

Question: Who used to sing for Black Sabbath?
Ian Gillan