In An Instant (2015)
S04E06 The Flintstone Canaries
Episode Overview
Fred decides to create a barbershop quartet to take part in the "Hum Along With Herman" TV contest. During rehearsals, he realizes that Barney has a fantastic talent for singing lead tenor. However, there's a quirky twist: Barney can only showcase his singing skills while he's in the bathtub.
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S04
