In the final installment of Ira Siff's "Opera Duos", we begin by stepping back in time, and listening to a recording over 100 years old! This episode spans operatic repertoire from Rossini to Wagner, highlighting operatic legends such as Enrico Caruso and Johanna Gadski, Ramon Vinay and Martha Mödl, Astrid Varnay and Hans Hotter, Renata Tebaldi and Franco Corelli, Birgit Nilsson and Franco Corelli, George London and Leonie Rysanek, Zinka Milanov and Jussi Björling, and Maria Callas and Tito Gobbi.