Listen to Unforgettable (Duet With Nat "King" Cole) (2000 Digital Remaster) online. Unforgettable (Duet With Nat "King" Cole) (2000 Digital Remaster) is an English language song and is sung by Nat King Cole. Unforgettable (Duet With Nat "King" Cole) (2000 Digital Remaster), from the album The World Of Nat King Cole - His Very Best (Expanded Edition), was released in the year 2013. The duration of the song is 3:28. Download English songs online from JioSaavn.