"Baby, the Rain Must Fall" is a 1965 Steve McQueen, Lee Remick movie. Elmer Bernstein and Ernie Sheldon wrote the title tune. The We Three Trio (Wally Keske, Myrna Janssen and Danny Janssen) sing the song but it doesn't appear in the motion picture. Even the 45 rpm release says it's from the movie and it does appear on the soundtrack album.
Once the guitarist and tenor for The Limeliters, Glenn Yarborough reached Billboard's top twenty with the song. It's interesting to note that when Glenn left The Limeliters he was replaced buy Ernie Sheldon (Ernest Lieberman) who co-authored "Baby the Rain Must Fall".