Film director Barrie Gavin selects Jonathan Harvey's Mortuos Plango, Vivos Voco, an electroacoustic piece made from the sound of the largest bell at Winchester Cathedral and the voice of the composer's chorister son. Commentator Gillian Moore describes how Harvey used technology at IRCAM in Paris to manipulate and integrate these two sounds, and we hear from Harvey himself on the significance of the bell's inscription and the qualities of its tonal spectrum.