"If I Can't Have You" is a disco song written by the Bee Gees in 1977. The song initially appeared on the Saturday Night Fever soundtrack in a version by Yvonne Elliman, released in November 1977. The Bee Gees' own version appeared a month later... Wikipedia
Composers: Bee Gees, Barry Gibb, Maurice Gibb, and more
A-side: "Stayin' Alive"