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Now here’s a novelty – an album of a live show from a tour to promote another live album. Consequently, the songs on these two discs closely mirror the running order of On Stage, with the addition of Long Live Rock’n’Roll, a preview of the title track from the following year’s studio set.

That song’s brevity and radio-friendly riffing are somewhat at odds with Ritchie Blackmore’s studious and expansive guitar work on Catch The Rainbow or the cover of The Yardbirds’ Still I’m Sad, arguably signalling a desire to break through to a broader and more commercial marketplace.

At times, Ronnie James Dio’s powerful vocals seem like an afterthought, but are given full throttle on Mistreated, a throwback to Blackmore’s days in Deep Purple.

Terry Staunton was a senior editor at NME for ten years before joined the founding editorial team of Uncut. Now freelance, specialising in music, film and television, his work has appeared in Classic Rock, The Times, Vox, Jack, Record Collector, Creem, The Village Voice, Hot Press, Sour Mash, Get Rhythm, Uncut DVD, When Saturday Comes, DVD World, Radio Times and on the website Music365.