Black Sabbath had left the band. Walker, who was at that time fronting a band called Mistress, flew to Birmingham from California in late 1977 to write material and rehearse with Black Sabbath. On 8 January 1978, Black Sabbath made their only live performance with Walker on vocals, playing an early version of the song "Junior's Eyes" on the BBC Television programme "Look! Hear!" Walker later recalled that while in Birmingham he had bumped into Osbourne in a pub and came to the conclusion that Osbourne was not fully committed to leaving Black Sabbath. "The last Sabbath albums were just very depressing
13 (Black Sabbath album) continue the world tour but would play the Download festival in June 2012. Instead of Black Sabbath, the tour would feature Osbourne and a revolving line-up of guest musicians, billed as "Ozzy and Friends." On 11 April, Lollapalooza founder Perry Farrell announced that Black Sabbath would perform at Lollapalooza 2012. Farrell said this would be Black Sabbath's only American concert in 2012. On 15 May 2012, Ward posted on his website that "after a final effort to participate in the upcoming Sabbath shows a failure to agree has continued" and that he would not be participating in the reunion shows,