Structure
The show features 16 choirs of up to 40 members participating in the competition, with 4 choirs competing per episode for the initial Round of 16. Each of those choirs has a Top Tune and a Battle Tune which they have prepared before the competition, and part of a Surprise Medley which is revealed to them on the day.
During the show, each of the choirs presents their Top Tune to the judges, and then the Surprise Medley occurs, in which all of the choirs sing part (45 seconds) of a medley. The judges then deliberate, and send one group to the next stage of the competition, and immediately eliminate another group. After that, the two choirs remaining are left to sing their Battle Tunes, one straight after the other, and the judges decide who gets promoted to the next leg of the competition and who gets eliminated.
The stages of the competition are (in order): Round of 16 (16 choirs, 4 episodes), Quarter finals (8 choirs, 2 episodes), semi final (4 choirs, 1 episode), grand final (3 choirs, 1 episode).
Read more about this topic: Battle Of The Choirs
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