Pitch Battle - Season 1 Episode 4 -

The six groups in this episode include an a cappella group, a pop choir from Liverpool, a show choir, an all-female country group, Portsmouth University Gospel Choir and a group of musical theatre performers. They must impress the panel of musical judges - Gareth Malone, Kelis and guest judge Seal. The programme opens with an epic musical mash-up, and the groups then go head to head in a series of knockout choral challenges. First they each perform their show-stopper before battling it out with their opponent in a themed riff-off. The judges then decide which group goes through to the solo battles. At the end of the programme only two groups remain, and they face the ultimate sing-off. They share the same song, before Seal joins in with the group the judges have chosen to go through.