This chapter delves into the Rossinian tradition and explores Tetrazzini’s recordings related to the roles of Rosina and Semiramide, even though Tetrazzini never performed Semiramide on stage during her career. I pay particular attention to the so-called lesson scene in Barbiere, which in the nineteenth century had already assumed a metatheatrical dimension, breaking the imaginary fourth wall with the audience. Tetrazzini’s interpretations are analysed in relation to nineteenth-century sources, with the idea that a line of continuity may be drawn between her and her predecessors.