The injury interfered with Hughes' ability to sing, and the band brought in vocalist Ray Gillen to continue the tour with W.A.S.P. and Anthrax, although nearly half of the U.S. dates would be cancelled because of poor ticket sales. One vocalist whose status is disputed, both inside and outside Sabbath, is Christian evangelist and former Joshua frontman Jeff Fenholt. Fenholt insists he was a singer in Sabbath between January and May 1985. Iommi has never confirmed this. Fenholt gives a detailed account in Garry Sharpe-Young's book "Sabbath Bloody Sabbath: The Battle for Black Sabbath". Black Sabbath began work on new material in October 1986 at Air Studios in Montserrat with producer Jeff Glixman. The recording was fraught with problems from the beginning, as Glixman left after the initial sessions to be replaced by producer Vic Coppersmith-Heaven. Bassist Dave Spitz quit over "personal issues", and former Rainbow and Ozzy Osbourne bassist Bob Daisley was brought in. Daisley re-recorded all of the bass tracks, and wrote the album's lyrics, but before the album was complete, he left to join Gary Moore's backing band, taking drummer Eric Singer with him. After problems with second producer Coppersmith-Heaven, the band returned to Morgan Studios in England in January 1987 to work with new producer Chris Tsangarides. While working in the United Kingdom, new vocalist Ray Gillen abruptly left Black Sabbath to form Blue Murder with guitarist John Sykes (ex-Tygers of Pan Tang, Thin Lizzy, Whitesnake). The band enlisted heavy metal vocalist Tony Martin to re-record Gillen's tracks, and former Electric Light Orchestra drummer Bev Bevan to complete a few percussion overdubs. Before the release of the new album Black Sabbath accepted an offer to play six shows at Sun City, South Africa during the apartheid era. The band drew criticism from activists and artists involved with Artists United Against Apartheid, who had been boycotting South Africa since 1985. Drummer Bev Bevan refused to play the shows, and was replaced by Terry Chimes, formerly of the Clash. After nearly a year in production, "The Eternal Idol" was released on 8 December 1987 and ignored by contemporary reviewers. On-line internet era reviews were mixed. AllMusic said that "Martin's powerful voice added new fire" to the band, and the album contained "some of Iommi's heaviest riffs in years."