1978: The Bee Gees owned the year. The Gibb brothers’ pop trio reinvented itself as a disco band, and recorded the soundtrack for Saturday Night Fever, which went on to become the bestselling album ever. The tracks “How Deep is Your Love,” “Stayin’ Alive,” and “Night Fever” all hit #1. So did “Shadow Dancing,” by Andy Gibb—a song the Gibbs wrote for their little brother.
1979: The power-pop band the Knack were marketed as the second coming of the Beatles, but they didn’t have many more hits beyond the great “My Sharona,” the bestselling song of the year. The Doobie Brothers won major Grammys for “What a Fool Believes,” while the big disco hit was “Le Freak” by Chic. The last #1 song of the year, and the ‘70s, was “Escape,” otherwise known as “The Piña Colada Song,” a tune about cheating on one’s spouse via the not-at-all-dated concept of personal ads.