As the chorus and soloists, including Bryn Terfel and Emma Thompson, join the New York Philharmonic and conductor Alan Gilbert onstage at Avery Fisher Hall for a concert performance of Sondheim's Sweeney Todd, everything seems perfectly ordinary, perhaps even a little bit dull. But then…well, enjoy the video below:

Thompson and Terfel star in Sweeney Todd at English National Opera in March and April next year. Visit ENO's website for further information.