The Beatles: Lies
Such were their abilities at the height of their powers that even the Beatles' b-sides were pop gems. "I Saw Her Standing There"? B-side. "I Should Have Known Better"? B-side. "Rain"? B-side.
While "Lies" is not as well know as those (it was only released as the flip side of "You're Gonna Lose That Girl" in the Benelux countries), it is just as good as any of them and deserves a more prominent spot in the Beatles cannon.