George Crumb (b.1929) is one of the great American experimental composers of the 20th century. His delicate scores are characterised by a child-like sense of wonder and an array of instrumentation that appears to have hitched a ride from outer space. Crumb first came to the fore in the 1960s with Songs, Drones and Refrains of Death (1968), Night of the Four Moons (1969), inspired by and composed during the Apollo 11 space flight, the savage string quartet Black Angels (1970) and Ancient Voices of Children (1970). In 1968 he won a Pulitzer for Echoes of Time and the River (1967). On the eve of a BBC Symphony Orchestra survey of his life and work at the Barbican of his life and work on 5 December, George Crumb lets us in on the secrets of his musical world.