The pitch was simple: “John Belushi, Dan Aykroyd, Blues Brothers, how about it?” But the film The Blues Brothers became a nightmare for Universal Pictures, wildly off schedule and over budget, its fate hanging on the amount of cocaine Belushi consumed. From the 1973 meeting of two young comic geniuses in a Toronto bar through the careening, madcap production of John Landis’s 1980 movie, Ned Zeman chronicles the triumph of an obsession.