Bobby McFerrin has done more than 'Don't worry, Be Happy', he's actually the winner of ten Grammy awards. One of the most popular singing improvisers, he has worked with Chick Corea and Herbie Hancock and is something of an ambassador for jazz and classical music. Here he will be performing with Marcin Wyrostek the winner of the last series of You've got Talent. Their short performance together will be a total improvisation so expect something exceptional. McFerrin's voice can stretch over four octaves, which sounds a bit painful, so don't try it at home!