The Bee Gees’ dominance of the charts in the disco era was above and beyond Chic, Giorgio Moroder, even Donna Summer. Their sound track to Saturday Night Fever sold thirty million copies. They were responsible for writing and producing eight of 1978’s number ones, something only Lennon and McCartney in 1963/64 could rival—and John and Paul hadn’t been the producers, only the writers. Even given the task of writing a song called “Grease” (“Grease is the word, it’s got groove, it’s got a meaning,” they claimed, hoping no one would ask, “Come again?”), they came up with a classic.