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Watch MK1 sing a Professor Green/Emeli Sande/Tinie Tempah mash-up
Only girl in the group, Charlie, says that music is the foundation of MK1's friendship. Watch as that very friendship is put to the ultimate test when the Judges ask them to reconsider the band's line-up. Will Charlie and Simeon bite the bullet and go it as a twosome? Will William take up a career in accountancy as suggested by Gary? Who knows!