About this "The Simpsons" episode:

The Simpsons - Homer's Barbershop Quartet marks the beginning of season 5, being the 1st episode and number 82 overall in the series.
This episode features The Be Sharps, a barbershop quartet founded by Homer Simpson. The band's story roughly parallels that of The Beatles. George Harrison and David Crosby guest star as themselves, and The Dapper Dans provide the singing voices of The Be Sharps.
The episode begins with the Simpson family as they attend a swap meet. There, Bart Simpson and his sister Lisa notice a picture of their father, Homer, on the cover of an old LP album. Homer explains to his family that he, Principal Skinner, Barney Gumble, and Apu Nahasapeemapetilon recorded a barbershop quartet album in 1985, which catapulted them to national fame. He narrates to his family the story of how the band formed, reached the pinnacle of success, and eventually folded. At the end of the episode, the group reunites to perform a concert on the roof of Moe's Tavern, singing their number-one hit "Baby on Board".
Throughout the episode, several references are made to The Beatles and other popular culture icons. In its original American broadcast, "Homer's Barbershop Quartet" finished 30th in ratings, with a Nielsen rating of 12.7. It was praised for its The Beatles cameo, despite being a leftover episode from the previous season. Reviews that criticized the episode's inconsistent humor blamed it on the change of writers before the episode's creation.