Radio 3 at the Summer Festivals. In a concert given at St Mary's Church, Hay-on-Wye as part of the 2009 Hay Festival, Russian-Israeli pianist Boris Giltburg performs music by Bach, Grieg and Rachmaninov. Boris Giltburg (piano) Bach-Busoni: Chaconne Grieg: Sonata, Op 7 Rachmaninov: Piano Sonata No 2, Op 36 (1931 version).