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is one of those perfect storm albums. As Deep Purple entered the 1970s, they undertook a creative shift from the psychedelic blues/pop of their late-’60s origins—embodied by hits like 1968’s perpetually catchy “Hush” and their cover of Neil Diamond’s “Kentucky Woman”—to move into full-on rock overdrive with June 1970’s and July 1971’s . With that tableau firmly set, Deep Purple ramped it up yet another notch to construct March 1972’s truly seminal , which features enduring hardrock staples like “Smoke on the Water” (ahh, that right-of-passage guitar riff), “Highway Star” (their 8-cylinder vehicular