So that there is no question in the mind of the listener, I rely principally on images of the LP and LP jacket in order to document the authenticity of historically important recordings such as these.
In this 1947 recording, Pia Tassinari (1903-1995) and Ferruccio Tagliavini (1913-1995) perform "Lontano, Lontano" from Act III of Boito's Mefistofele. I created this video from the LP depicted above, issued on the Certa-Soria label, serial number 50.018. There is no indication anywhere on the LP which orchestra is accompanying the duo.
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Also from this LP:
Pia Tassinari / Ferruccio Tagliavini: "Parigi, O Cara, Noi Lasceremo" (Traviata):
Pia Tassinari / Ferruccio Tagliavini: "Or Lasciami Al Lavoro" (Tosca):
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Bidú Sayão, Rita Streich, Pia Tassinari, Ferruccio Tagliavini, Marian Anderson, The Robert Shaw Chorale: "David Hertzberg"