Kirsty Young's castaway this week is the musician, Alison Balsom. Widely considered the finest classical trumpet player of her generation, she's performed in all the great concert halls of the world, winning a huge amount of fans and a string of awards for her ability to exquisitely convey the many voices of her chosen instrument. As a child she had dreams of being a part-time trumpet player, astronaut and jockey - she's only 36 so there's time yet for the other two; but whilst she is solely devoting her energies to her instrument her belief in the power of music seems endless. In between gigs, rehearsals, recordings and motherhood, she's found time to travel to Uganda and Liberia as patron of Brass for Africa, with the heartfelt conviction that she can transform the lives of street children by teaching them to play. Producer: Sarah Taylor.