Sondheim Musical, in Development for Years, Looks Unlikely The 91-year-old composer told the Public Theater last year that he was no longer working on a show based on the films of Luis Buñuel. Stephen Sondheim, who had been working on developing “Buñuel” for the last decade or so with the playwright David Ives.Credit...Fred R. Conrad/The New York Times April 27, 2021, 2:47 p.m. ET One big lingering question for theater fans following the news that the prolific producer Scott Rudin will “step back” from his stage projects: What will happen to his shows in development, notably the Stephen Sondheim musical “Buñuel,” which at last report was slated to be produced Off Broadway at the Public Theater?