When Ken Hollings underwent surgery at Moorfields Hospital for a detached retina he experienced an unexpected symphony inside his head, right between the ears. The sounds have haunted him ever since. Musician Martin McCarrick also found himself in a terrifying and unsettling world of head noise that began with a perforated eardrum and ended in a rare medical condition. He too has never forgotten the unexpected world of noise he heard between his ears and has set about recreating it. In this binaural edition of Between the Ears Ken Hollings goes in search of his primal sound. Producer: Mark Burman