The Barbershop Boys/History

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They're based on Barbershop music, specifically the Barbershop quartet; this group format normally consists of four male vocalists, with one as a lead who bridges the other three, usually consisting of a tenor, a baritone and a bass vocalist. The style is often sung as a cappella.
The quartet were found by Queen Barb in a diner where Trolls whose music became unpopular ended up. Barb hired them along with the other Trolls at the diner to get Queen Poppy.https://www.instagram.com/p/B-3A1HahNMQ/https://www.instagram.com/p/B-3COX0hT62/
The Barbershop Boys, alongside all Trolls of the other subcultures, were in the original plot of Trolls World Tour. Queen Barb wanted to destroy all music because she was jealous of the popularity of Pop. In her journey to rid the world of all music but Rock, Barb came across a diner in the middle of nowhere, where Trolls whose music lost popularity ended up. Barb offered an opening slot in her world tour to whomever brought her Queen Poppy. The presence of the Barbershop Boys indicated that Barbershop music had fallen out of popularity, and that the quartet were among the few, if not only Barbershop Trolls left.
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