After last show's semi-final performances in front of the judges, it is time for the final three to battle it out. They face their biggest challenge yet as they perform in front of an audience of thousands at one of the world's most prestigious choral music festivals - the International Eisteddfod in Llangollen. In the audience will be the three expert judges who will decide which choir will win the overall contest and be crowned Gareth's Best Workplace Choir.