Ken Clarke MP profiles great jazz musicians of the 20th century. Many Radio 4 listeners knew 'Humph' as the hilariously deadpan chairman of I'm Sorry I Haven't a Clue. But the much-loved broadcaster was also an exemplary and influential jazz musician. Louis Armstrong dubbed him 'the top trumpet man in England today', and not without reason. A master of his instrument as well as several others, he spearheaded the post-war traditional jazz revival in Britain, later forming his own band that set the standard for British jazz for several decades. Friend and fellow BBC jazz presenter Alyn Shipton joins Ken in the studio to discuss Britain's most important jazz musician.