"Unforgettable" is a popular song written by Irving Gordon. The song's original working title was "Uncomparable". The music publishing company asked Irving to change it to "Unforgettable". The song was published in 1951.
The most popular version of the song was recorded by Nat King Cole in 1951, with an arrangement written by Nelson Riddle. A non-orchestrated version of the song recorded in 1952 is featured as a bonus track on the CD reissue of 1955's completely instrumental (save the bonus material) Penthouse Serenade. Cole again recorded the tune in 1961, in a stereo version of the Riddle arrangement, for the album The Nat King Cole Story. His version of the song was included in its entirety in the 2009 film Watchmen.
In 1991, after Elvis Presley's legendary musical director Joe Guercio had the idea, Cole's 1961 recording of the song was edited and remixed to create a duet with his daughter, Natalie, which won three awards at the Grammy Awards of 1992: Song of the Year, Record of the Year and Best Traditional Pop Vocal Performance .