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After doing for heavy metal what Blazing Saddles did for westerns, This Is Spinal Tap also managed to spark a minor cottage industry known as the Christopher Guest mockumentary. Now, Tap was hardly the first fake rock documentary, since The Rutles had been around for several years. Eric Idle’s spoof of Beatlemania, however, never got near the National Film Registry as did Rob Reiner’s affectionate yet lacerating take on head-bangers.