Clemency Burton-Hill celebrates the rich and ravishing world of the string quartet in a journey through 50 years of BBC archive. Some of the world's greatest ensembles including the Amadeus, Chilingirian, Borodin and Kronos quartets perform in myriad styles and settings, from stately homes to helicopters. Music ranges from Mozart, Beethoven and Schubert to Steve Reich, Elvis Costello and Pete Townshend, in a tradition which stretches back to Haydn in the 18th century.