Christopher Guest and Michael McKean (Reuters/Ethan Miller)

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Harry Shearer (the voice of Mr Burns, Ned Flanders, Otto and others) got his old spoof rock band Spinal Tap back together for an animated outing in season three's 'The Otto Show', with his old cohorts Christopher Guest and Michael McKean reprising their roles as Nigel Tufnel and David St. Hubbins from the classic mockumentary. A typically chaotic Tap show in Springfield ends in a riot, which nonetheless inspires Bart to take up the electric guitar.