First up, the judges want to get an immediate sense of the artists' identities through an impromptu performance of an original signature song each artist has written. With their place in the competition on the line, nerves run high.Having been thrown in at the deep end, the challenges keep coming. The artists head to a multi-million pound mansion, on a mission to show the judges their mastery of social media.Who will define themselves in the eyes of the judges, and who will fade into the background and end up going head to head in a sing-off to stay in the competition?