If you have any doubt who the greatest singer in the history of metal, heck, maybe in the history of rock ‘n’ roll is, just pop this DVD into your player and fast forward to the second song.

At the time, punk was thought of as the fast and rough stuff, with classic rock geezers like Ritchie Blackmore already relegated to the dustbin of history. Hardly. Rainbow’s molten Live in Munich, recorded in 1977, zips along at a blinding pace.

The news that Brad Wilk will be sitting in the drum chair for Black Sabbath’s forthcoming reunion album had us taking a look back at the huge shoes he’ll be filling.

This new two-disc set of rarities and unreleased tracks, built around a double-sided benefit single from Ian Gillan and Tony Iommi, traces a series of intriguing side trips traveled by Deep Purple and Black Sabbath.