Conductor and pianist Daniel Barenboim , director of the Chicago Symphony Orchestra and music director of the Deutsche Staatsoper in Berlin, discusses the art of playing Johann Sebastian Bach. Plus a look at what makes an "original" work of art - is the art-buying public being misled? With Charles Hazlewood. Producer Marcus Herbert ; Executive editor George Entwistle
Repeated at 11.20pm www.bbc.co.uk/cultureshow