Spinal Tap is the loudest band in England and they’re making a comeback with a North American tour promoting their new album Smell the Glove. Mary DiBergi (Rob Reiner) sets out to make a documentary of the legendary rock band’s exploits on the road, featuring front men Nigel Tufnel (Christopher Guest) and David St. Hubbins (Michael McKean) and bassist Derek Smalls (Harry Shearer), bearing witness to the highs and lows of what makes a musician into a rock star.