This app will stop working on 3rd April 2017. But you can still listen to BBC iPlayer Radio via your browser by visiting bbc.co.uk/radio
The Escher String Quartet perform one of Schubert's unfinished pieces, Quartettsatz in C Minor.
See all clips from Escher String Quartet
See all clips from Radio 3 Lunchtime Concert
Sign in to the BBC, or Register