"So Long" is a song written by Remus Harris, Russ Morgan and Irving Melsher in 1940 and later recorded by Russ Morgan and his orchestra. The song was first a hit for the Charioteers, whose single reached number 23 on the U.S. pop chart in 1940. The best-known version was recorded by Ruth Brown, whose rendition reached number 6 on the U.S. Billboard R&B chart in 1949. The Four Aces' cover, backed by the Jack Pleis Orchestra, peaked at number 26 on the U.S. Billboard Hot 100 chart in 1954. Roy Hamilton's cover peaked at number 14 on the U.S. Billboard R&B chart in 1957.