Unforgettable Sample (Downloadable) This is a 2nd edition version of the lesson so it has been completely re-recorded. In this lesson you will learn a jazz melody chord style arrangement of the Nat King Cole hit without using any music. There is a complete demonstration of the song followed by a detailed lesson where the song is taught in 2 to 4 measure sections. At the end of the lesson you are given the backing tracks without the piano for you to perform the song with.