One of the most overlooked gems hidden in the treasure-trove of The Beatles' mind-numbingly incredible 1966 album Revolver is Got To Get You Into My Life. It's credited, much like most of their repertoir, to the Lennon-McCartney partnership, but it was written almost solely by McCartney.
If you're not a Beatles fan I'd still urge you to give it a listen. It's a brilliantly uplifting track and well worth the short 2 minutes, 29 seconds required to experience it.
Listen to it there and then go and buy the album if you don't already have it. It's one of their finest.