March of the Meanies
One of the instrumental tracks appearing on side two of the 1969 release Yellow Submarine composed by George Martin. This is not a "Beatles Song" per se but rather a track appearing on the album that was part of the score of the film Yellow Submarine.
Yellow Submarine is an original studio album in name only. It wasn't a real studio efforts and only contained 4 previously unreleased songs. It's much more of a soundtrack.