While the Beatles left behind countless iconic images and performances in addition to their music, do you ever wonder where their signature style came from? The answer is Brian Epstein, whom Paul McCartney famously called "the fifth Beatle." While Epstein was slowly shaping the band's sound, the Fab Four's onetime manager also influenced their famous fashions -- most notably those signature matching suits.

Using archived footage from the foursome's heyday plus interviews with peers and family members, the documentary 'Brian Epstein - Inside the Fifth Beatle,' is one of the best primers for Epstein's vast contributions to the Beatles. Beginning with his start as a record store owner to his untimely death in 1967, the film could be seen as evidence that Epstein was just as influential on the band as its actual members. "That guy could smell a hit record," his assistant Alistair Taylor says in the film, "even though he didn't like pop music."

For an in-depth look at one of rock history's most important yet unheralded figures, be sure to check out the documentary after the jump, courtesy of our friends at SnagFilms.