Twenty Minutes - Ba Ba Ba Bum: The Art of the Riff

Beethoven's Fifth Symphony boasts the most famous riff in the classical canon. Curate, keyboardist and Radio 3 reviewer Richard Coles investigates the power of the repeated phrase, talking to classical and film composer Jocelyn Pook about how she conjures, finds and uses them, and to musician Tom Robinson, who has written a few, about the importance - and the burden - of the riff to him. Richard also ponders whether there is much difference in musical intent and practice between the opening of Beethoven's Fifth and the opening of Smoke on the Water by Deep Purple.