The stepson of late Black Sabbath keyboardist Geoff Nicholls released a demo of a song from around 1979 that features Ronnie James Dio on vocals.

While Gary Rees admitted that the track – which he believes was titled “Slapback” – didn’t come across like a Sabbath piece, he said he’d found it on a cassette tape that contained other material recording during the band’s preparation sessions for the following year’s album, Heaven and Hell.