Rob Reiner directed this howlingly funny 1984 mockumentary, a parody of music documentaries about a wildly self-obsessed heavy-metal band. Band members, the central ones, are played by Harry Shearer, Christopher Guest, and Michael McKean. McKean, like Carrie Coon on tonight’s Fargo, just figured prominently in a memorable season finale – in his case, as Jimmy McGill’s brother Chuck on AMC’s Better Call Saul, whose final appearance of the season was positively incendiary. Here, he’s much more laid-back, and almost recognizable, as Spinal Tap musician David St. Hubbins.