11. George Harrison W/ David Crosby - (S5 E1- "Homer's Barbershop Quartet")
As before mentioned Matt Groening was a big fan of the Beatles, as were many other of the show's creators. So with this in mind they decided to spoof the Beatles career by telling the story of Homer's rise to fame as 1/4 of a Barbershop Quartet. With analogies to The Beatles throughout, it was topped off by a cameo appearance by George Harrison and is a smaller, less-Beatles-minded David Crosby who was also 1/4 of a pretty good band with ego issues.