Presented by Jonathan Swain. As part of a series celebrating Czech chamber music, Thomas Zehetmair and Ruth Killius demonstrate their versatility as they play works from Mozart's masterly examples to the highly imaginative Madrigale by Martinu inspired by Renaissance polyphony. Thomas Zehetmair (violin) Ruth Killius (viola) Skalkottas: Duo for violin and viola Mozart: Duo in G for violin and viola Holliger: Three Sketches (12) Mozart: Duo in B flat Martinu: Madrigale.