Opera duo Charlotte & Jonathan - Britain's Got Talent audition . Janet Devlin's audition - The X Factor (Full Version) - YouTube Your Song Homeless Boy Steals The Talent Show (very humble) His name is Sung Bong Choi. Jonathan Antoine (born 13 January ) and Charlotte Jaconelli (born 24 August ), known collectively as Jonathan and Charlotte, were an English classical crossover duo from Essex. They finished as runners-up in the sixth series of Britain's Got Talent in , . Graham Stack, who was behind the first three albums of X Factor stars G4.