Sweeney Todd: The Demon Barber of Fleet Street in serialized Victorian popular fiction, known as "penny dreadfuls". A story called "The String of Pearls" was published in a weekly magazine during the winter of 1846-47. Set in 1785, the story featured as its principal villain a certain Sweeney Todd and included all the plot elements that were used by Sondheim and others ever since. The murderous barber’s story proved instantly popular – it was turned into a play before the ending had even been revealed in print. An expanded edition appeared in 1850, an American version in 1852, a new play in 1865. By the 1870s, Sweeney Todd
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),