The music of Johann Sebastian Bach is considered to be amongst the greatest of all time. But who was the man behind the music? What did he think, feel and believe? What inspired him and what drove him to write such ground-breaking compositions? Professor John Butt, Bach Scholar and director of the Dunedin Consort explores Bach's life and work. He considers the composer's motivation and his character speaking to composers and musicians to delve into his personality and his purpose. Producer: Katharine Longworth.