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Host Claudia Winkleman invites gifted amateur pianists to play live at some of the nation's busiest train stations, from London St Pancras to Glasgow Central. As the musicians play, little do they realise that they're involved in a new competition, judged by renowned virtuoso pianist Lang Lang and platinum-selling pop musician Mika. The judges' chosen contestants are then invited to perform to a concert audience of thousands in the show's grand finale.