Unforgettable is a popularsong 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.
Semprini with Rhythm Acc. recorded it in London on March 26, 1952 as the third melody of the medley "Dancing to the piano (No. 14) - Part 1. Hit Medley of Foxtrots" along with "Slow Coach" and "Cry". It was released by EMI on the His Master's Voice label as catalog number B 10263.