Sean Rafferty presents a selection of music and guests from the arts world. Ahead of a Prom he is to conduct, Yan Pascal Tortelier discusses his approach to the programme of Bax, Rachmaninov and Vaughan Williams. Barry Douglas and Alison Balsom talk about their Barbican concert, which includes Shostakovitch's Piano Concerto No 1 and a new trumpet arrangement of Queen of the Night.