Tue, Sep 22, 2015
Gareth mentors the first four a cappella groups.
Tue, Sep 29, 2015
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.
Tue, Oct 6, 2015
Gareth brings the six remaining groups together to undergo intensive tutoring before they go head to head once more.
Tue, Oct 13, 2015
The five remaining groups undergo intensive training with more expert help and a new focus on performance technique.
Tue, Oct 20, 2015
In the semi-final, the four groups left standing must create a video with the potential to become an internet hit.
Tue, Oct 27, 2015
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.