This Is Spinal Tap

This Is Spinal Tap is a 1984 comedy movie. This movie pretends to be a documentary. It pretends to tell the story of a rock band called "Spinal Tap." In the movie, the members of this band are David St. Hubbins, Derek Smalls and Nigel Tufnel. They are played by actors Michael McKean, Harry Shearer, and Christopher Guest.
Rob Reiner directed the movie and also acted in it. He pretended to be Marty DiBergi, director of the documentary.