The Tale of Sweeney Todd character of Sweeney Todd, the Demon Barber of Fleet Street, originated in an 1846–47 penny dreadful entitled "The String of Pearls". In 1847, George Dibdin Pitt adapted the story for a stage melodrama. A directed by George King was the first screen version. Christopher Bond's 1973 stage adaptation was musicalized by Stephen Sondheim in 1979. Schlesinger's film is a dramatic departure from the previous narratives. It dispenses with all the characters except Todd and Lovett, adds the plotline involving the missing diamonds, and offers a completely different reason for Todd's murder spree. The Victorian era locales were filmed in Dublin,
Sweeney Todd: The Demon Barber of Fleet Street of the story. In the play, Sweeney Todd’s mental collapse and the subsequent plan for Lovett's meat pies take place in less than half a page of dialogue, much too quickly to convey the full psychological impact, in the view of scholar Larry A. Brown. Sondheim's version more carefully reveals the developing ideas in Sweeney Todd and Mrs. Lovett's demented minds. Sondheim has often said that his "Sweeney Todd" was about obsession – and close friends seemed to instinctually agree. When Sondheim first played songs from an early version of the show for Judy Prince (wife of the show's director),