Barbershop is a style of a cappella vocal music, characterized by four-part harmony.
Standards withing the Barbershop style include "Let Me Call You Sweetheart", "My Wild Irish Rose", "Sweet Adeline", "Shine On Harvest Moon", and "Sweet Georgia Brown". Barbershop harmony also plays an important role in the Broadway musical The Music Man, with the harmonies being folded into songs such as "Pick a Little, Talk a Little".
- The Barbershop Cactus Quartet appear in episode 102 of Muppets Tonight, but never get to perform on the show.
- The Andy Williams Muppets, along with Andy Williams compose a Barbershop Quartet that appear in episode 422 of The Muppet Show, where they perform "Jubilee Time".
- A Anything Muppets barbershop quartet sings about counting floors when they go up and down in an elevator on Sesame Street (EKA: Episode 0889).
- Sam the Eagle, Rowlf the Dog, Link Hogthrob and Beaker form the Muppets Barbershop Quartet on The Muppets, performing Nirvana's "Smells Like Teen Spirit."