These singers for hire are not just an experienced, well-rehearsed, unique a cappella group. There’s something about them thatʼs far more profound than sell-out performances and vivacious vocals: they are all great friends. Itʼs this connection between the members of the London-based group that has hooked audiences up and down the country. Itʼs what defines their sound, showmanship and insanely catchy pop mash-ups. What other group can merge Eye of the Tiger with Beyoncéʼs Bootilicious, pull off a ballad like Kiss from a Rose and round everything off with a Garage medley?