Anna Case (October 29, 1887 – January 7, 1984) was an American operatic soprano. She recorded with Thomas Alva Edison, who used her voice extensively in "tone tests" of whether a live audience could tell the difference between the actual singer and a recording. In addition to recordings for Edison Records on both phonograph cylinder and Diamond Disc, Case recorded for Victor and Columbia Records, and made sound film for Vitaphone. * 1912 Metropolitan Opera premiere of Boris Godunov with Anna Case, Marie Duchène, Adamo Didur as Boris Godunov, and Leonora Sparkes *