The Beatles vs. Lush Life

Lush life, music and lyrics by Billy Strayhorn. Written "between 1933 and 1936," when Strayhorn was a teenager. 

If you are looking for innovation in the song form, look no further. This song is written in D-flat major, with, let's say, lots of chords and modulations. The melody is nuts; it appears to have been born out of the sea fully formed on a seashell like Venus in that Botticelli painting. There are other songs for which you could make a vague case of similarity, but not many. 

This version is favored by many fans of the jazz standards, but the song has been recorded by about fifty artists, from Nat King Cole to Lady GaGa (with Tony Bennett).