Straddling the worlds of musical comedy and rock and roll, "Sweeney Todd"'s Michael Cerveris talks about how his extensive work with Stephen Sondheim makes it hard to sing more conventional musical theatre works, recounts learning how to be a rock star from Pete Townshend of The Who in preparation for "Tommy", and recalls how his disparate performing worlds united in "Hedwig and the Angry Inch". Original airdate - January 20, 2006.