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This Is Spinal Tap, American film comedy released in 1984 that parodies the “rockumentary” film genre via the exploits of the fictional heavy metal band Spinal Tap. Directed by American filmmaker and actor Rob Reiner, the film was largely improvised by Reiner and the core cast members—American actors Michael McKean and Harry Shearer and British-American actor and director Christopher Guest. Its success led to a series of documentary parodies directed by Guest, including Waiting for...