"Sweeney Todd: The Demon Barber of Fleet Street" is a musical thriller created by Stephen Sondheim. It tells the story of Benjamin Barker, a barber wrongfully imprisoned who returns to London as Sweeney Todd seeking revenge on the corrupt judge who ruined his life. He partners with Mrs. Lovett, a pie shop owner, to exact his vengeance. The narrative unfolds in a dark, Victorian setting, highlighting themes of injustice, obsession, and the consequences of revenge. The musical features haunting melodies and complex characters, making it a significant work in the genre of musical theater.