As Sondheim's Sweeney Todd makes its debut run at the Royal Opera House,
Edward Seckerson hosts an exploration of the current boundaries between opera and musical theatre. Guests include Antonio Pappano , Thomas Allen , Julia McKenzie and Paul Gemignani.
ADDRESS: Stage and Screen, Room 220, Broadcasting House. Queen Margaret Drive , Glasgow G12 8DG email: stageandscreen@bbc.co.uk