Composer Giacomo Puccini Librettists Luigi Illica and Giuseppe Giacosa Based On the drama La Tosca by Victorien Sardou Company San Francisco Opera Association Location San Francisco, CA Venue Civic Auditorium Season 1927 Language Italian Creative/Crew Conductor Gaetano Merola Stage and technical director Armando Agnini Chorus Master Giuseppe Papi Cast Floria Tosca Anne Roselle Mario Cavaradossi Mario Chamlee Baron Scarpia Antonio Scotti Spoletta Angelo Bada Cesare Angelotti Louis D'Angelo Sciarrone Louis D'Angelo Sacristan Desiré Defrère Jailer Evaristo Alibertini Shepherdess Hazel Huff Show Dates Sat, Sep 17 1927, 8:15pm Time and Place Rome Scenes Act I -- Interior of church of St. Andrea, Rome Act II -- Scarpia's offices in the Farnese Palace Act III -- Battlements of the Prison