I prefer some Cheese and Onions, as well as some people in this thread need to need to Get Up and Go. Watching those musical mockumentaries truly feels like a Twice in a Lifetime Experience.Other than Spinal Tap, you don't have any of the top 5 on that list.
Buckaroo Banzai and The Fabulous Stains have already been mentioned.
The others are:
and, of course, number one on the list has to be The Rutles (The producers sent a copy of the film to John Lennon to get his approval, and he loved it so much he refused to return the copy; George Harrison had agreed to be in it).