"If You Go Away" is an adaptation of the 1959 Jacques Brel song "Ne me quitte pas" with English lyrics by Rod McKuen. Created as part of a larger project to translate Brel's work, "If You Go Away" is considered a pop standard and has been recorded by many artists, including Greta Keller, for whom some say McKuen wrote the lyrics.[1]
The complex melody is partly derivative of classical music: the "But if you stay..." passage comes from Franz Liszt's Hungarian Rhapsody No. 6.