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 recorded the tune anew in 1961, in a stereo version of the Riddle arrangement, for the album The Nat King Cole Story.
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Nathaniel Adams Coles (March 17, 1919 February 15, 1965), known professionally as Nat King Cole, was an American singer and musician who first came to prominence as a leading jazz pianist. He was widely noted for his soft, baritone voice, which he used to perform in big band and jazz genres.
Cole was one of the first African Americans to host a television variety show, The Nat King Cole Show, and has maintained worldwide popularity since his death from lung cancer in February 1965. From Wikipedia