In the final scene of David McVicar’s thrilling production of Puccini’s Tosca, the title character leaps off the parapet of the iconic Castel Sant’Angelo after realizing that Cavaradossi’s execution was real. Last week, we went behind the scenes with sopranos Angela Gheorghiu and Liudmyla Monastyrska to rehearse this dramatic conclusion. Gheorghiu takes the stage tomorrow, April 8, and Wednesday, April 12, and Monastyrska returns to the stage Saturday, April 15, for the final performance this se