Thirty years ago today, March 2, 1984, the film This is Spinal Tap was released. This rockumentary, or mockumentary, directed by Rob Reiner, featured Christopher Guest (Nigel Tufnel), Michael McKean (David St. Hubbins), Harry Shearer (Derek Smalls), and a bevy of actors and actresses in guest spots. Numerous actors filled in the role of drummer. …