If you are including "This is Spinal Tap" you should also include the overlooked film "Walk Hard - The Dewey Cox Story". It's as funny as Spinal Tap and it manages to spoof all music documentaries in one film. It has all original songs in many different styles sung by John C. Reilly. If they gave Academy Awards to actors in comedies Mr. Reilly should have been a contender. What he does in this movie is as difficult as what Robert De Niro did in Raging Bull.