This episode includes interpretations of songs by Sam Smith, Walk the Moon, Frank Sinatra, Clean Bandit and Nirvana, as well as a Disney musical.

In this fourth episode of the singing contest hosted by Rob Beckett, memorable performaces include two brothers singing a Morecambe and Wise classic and a charity worker with a jaw-dropping interpretation of Labrinth's Jealous. A range of talented singers take to the stage to perform in front of the 100 - a panel of music experts and performers from all over the UK. If any of the 100 like what they hear, they can stand up, join in and sing along. The greater the number that join in, the higher the act's score. Heading up the 100 is Spice Girl Geri Horner, who, as a member of the the best-selling girl group of all time, knows exactly what it takes to get a crowd joining in and singing along. The winner is guaranteed a place in the final, with the acts in second and third place each performing another song in a sing-off, the winner of which also goes through.