If you never saw a Tim Burton adaptation of a Stephen Sondheim musical coming, you weren't alone. The director, who had made a career out of bringing his grim visions of loner life to the big screen, didn't necessarily seem like the kind of guy who would willingly adapt a work by the king of musical theater. But then, Burton was never one for orthodoxy, and as unlikely as his 2007 effort was, "Sweeney Todd: The Demon Barber Of Fleet Street" stands as proof that even a Sondheim musical can be...