Emma Willis and Marvin Humes present the second of the knockout rounds. The coaches watch each of their contestants perform and must choose the best acts from their team to continue on to the live shows. It is now the artists who take control - they must each choose one 'killer song' that they think will give them the best chance to impress their coach. Tensions and adrenaline run high as the artists give the performances of their lives to make it through the knockouts and on to the live shows.