'Is Spinal Tap is a 1984 mockumentary film directed by Rob Reiner. It follows the fictional British heavy metal band Spinal Tap on tour in the United States. The film satirizes the wild personal behavior and musical pretensions of hard rock and heavy metal bands, as well as the hagiographic tendencies of rock documentaries of the time. The film's title is a play on the phrase 'It's a fine line between clever and stupid'. The film has since become a cult classic.'