A documentary, a mockumentary, indeed a rockumentary--Rob Reiner's phony road movie following the exploits of a fictitional heavy metal band has long been celebrated as a comedy landmark. This book is the first attempt to provide a sustained critical appraisal of the film's success, addressing general cinephiles and devoted Tapheads alike. The study considers the film within the context of cult cinema, real and mock documentaries, Hollywood comedies and musicals, and the history of rock music. This detailed stylistic and comic analysis offers new insights into the ardent Cult of Tap.