Maynard James Keenan has expressed concern about what to expect from Ozzy Osbourne’s final performance at the Back to the Beginning concert in July.

Black Sabbath retired following an extensive farewell tour from 2016 to 2017. The shows featured three of the band’s four founding members – singer Ozzy Osbourne, guitarist Tony Iommi and bassist Geezer Butler – but not original drummer Bill Ward, who pulled out of the band several years earlier due to a contract dispute.