A purportedly unreleased Ronnie James Dio-era Black Sabbath song titled “Slapback” has been uploaded to YouTube. The track was sourced from what appears to be a cassette recording of Black Sabbath’s 1979 “Bel Air” rehearsals for their seminal 1980 album Heaven and Hell. It was uploaded by the estate of longtime Sabbath keyboardist, the late Geoff Nicholls. Nicholls’ stepson and executor of his estate Gary Rees offered some background on the unearthed recording in the video description: “This latest upload from the Geoff Nicholls estate I believe is called ‘Slapback’ from the scrawling on the cassette and the chorus. This is from the same cassette as the ‘Heaven & Hell’ upload on this channel. It doesn’t sound like a typical SABBATH song, if it is them, but it does sound like Ronnie Jam...