Heaven and Hell is a 2006-2008 musical collaboration featuring Black Sabbath members Tony Iommi and Geezer Butler along with former members Ronnie James Dio and Vinny Appice. Appice and Dio also performed together in Ronnie James Dio's band, Dio. In 2006, while the foursome reunited to record three new songs for the compilation album, Black Sabbath: The Dio Years, they decided to embark on a 2007-2008 tour. This was facilitated by the fact that current/founding Black Sabbath vocalist Ozzy Osbourne was slated to perform a solo tour during that time frame. Because of the projected continuation of the band's original lineup (Iommi, Butler, Osbourne and Bill Ward) and the 2006 induction of said lineup into the Rock and Roll Hall of Fame, Iommi (owner of the Black Sabbath name) and Dio decided to call the touring group Heaven and Hell. The moniker was taken from the first Dio-fronted Black Sabbath recording, Heaven and Hell.