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Gareth Malone searches for Britain's most entertaining amateur singing group, in a music contest with a difference - groups must sing a cappella.
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Episode 1
Gareth mentors the first four a cappella groups: a London community choir, an Essex gospel group, six Southampton students and a group of Portsmouth women barbershop singers. They will sing for a live audience and a jury of experts will decide who stays in the contest and who is eliminated.