“Unforgettable” is a historic, deeply emotional 1991 traditional pop and jazz ballad that achieved legendary status through a groundbreaking technological duet between the late Nat King Cole and his daughter Natalie Cole. Produced by David Foster, the track seamlessly spliced Nat King Cole’s original 1951 vocal master tape with newly recorded vocals from Natalie, layering them over a updated, lush orchestral string arrangement. The result is a seamless, beautiful, and boundary-pushing cross-generational musical conversation.