Renée Fleming talks about first working with Bryn Terfel.   Find out why the star loves performing songs from musical theater.   The singer on the compelling melodies of Stephen Sondheim.   Bryn Terfel describes his first encounter with Renée Fleming.   The opera star talks about his introduction to musical theater.   The bass baritone discusses learning "Sweeney Todd." The free RealPlayer plug-in is required to watch these video excerpts.