George Harrison (Wireimage)

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The late George Harrison popped up during the episode 'Homer's Barbershop Quartet', which was loosely based on the career of The Beatles. Creator Matt Groening remarked that Harrison was one of his favourite ever guest stars as he was "super nice" to the show's staff.

Harrison's former band mates Paul McCartney and Ringo Starr have also appeared as themselves in the show.