Born in Coventry in 1937, Delia Derbyshire joined the BBC in 1960 ... of the Dr Who theme tune. Discover the enormous range of Delia’s creativity through Radio 3 Breakfast's five musical mixes ...

It isn't a tune. It's a kind of aural doodling that dissipates tension. He probably does it often. David Cameron is starting to sing the theme from 'The Great Escape', and then he's changing it to ...