"Summer Nights" is a popular song from the musical Grease. Written by Jim Jacobs and Warren Casey, its best-known version was recorded by John Travolta, as Danny Zuko, and Olivia Newton-John, as Sandy Olsson, for the big-screen adaptation of the musical, and released as a single that same year. "Summer Nights" became a hit in both the United States and United Kingdom during the summer of 1978. Included on the movie's soundtrack album, the song was one of several hit singles from the movie. New Brian and Lois Griffin sing it during karaoke night in "The Man with Two Brians".