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6 Episodes 2015 - 2015
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.
Episode 2
Gareth mentors the four a cappella groups from the north: some Salford students, a Midlands barbershop group, a group from Glasgow University, and a Birmingham sextet.
Episode 3
Gareth brings the six remaining groups together to undergo intensive tutoring before they go head to head once more.
Episode 4
The five remaining groups undergo intensive training with more expert help and a new focus on performance technique.
Episode 5
In the semi-final, the four groups left standing must create a video with the potential to become an internet hit.
Episode 6
In the grand final, the three finalists must compete in front of a thousand-strong audience at London's prestigious KoKo and impress a jury of a cappella experts.