The Flintstones Season 4 Episode 6
Fred forms a barbershop quartet to compete on the “”Hum Along With Herman”” television show, and in the process discovers that Barney is a natural lead tenor. The catch is that Barney can sing only when he’s in the bathtub.
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Serie: The Flintstones
Director: William Hanna
Guest Star: Don Messick, Howard Morris, Jean Vander Pyl, John Stephenson, Mel Blanc