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The cultural legacy of the 1984 rock-mock-doc “This Is Spinal Tap” is of sufficient amplitude that, to give the band’s guitarist Nigel Tufnel (Christopher Guest) his knob-twiddling due, it’s gone way past 11.

Perennially quotable, ad-libbed to Brit-accented perfection by co-creators Guest, Michael McKean and Harry Shearer and finessed into an iconic spoof by director Rob Reiner, “Spinal Tap” was born. The movie both ridiculed (and, slyly, furthered the cause for) the metal world’s idiotic excesses, but also an industry’s love of a satisfying comeback saga.

When your fake movie becomes gospel truth to admiring music legends and a pretend forgotten band goes on to play Wembley in rea

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