Here are the items that we found.
Free Streaming Titles
Castelnuovo-Tedesco: The Importance of Being Earnest (in Italian)
Andreolli, Misciano, Zanini, Adani; Campori. RAI, 1972
Compilation: Amy Shuard
Excerpts from Macbeth, Walküre, Götterdämmerung, Katya Kabanova, Tristan & more
Compilation: Anne Evans
Excerpts from Temistocle, Die Fledermaus, Dalibor, La Traviata, Lohengrin, Walküre, Elektra & Die Frau ohne Schatten
Compilation: Martina Arroyo in Concert
Amsterdam, 1967. BONUS: Martina Arroyo Sings Verdi
Mozart: Così fan tutte (In English)
Harwood, Baker, Curragh, Westi, Van Der Bilt, Shirley-Quirk; Gibson. Glasgow, 1969
Puccini: Turandot
Tinsley, Martí, Huang; Hetu. Edmonton, 1974
Strauss: Ariadne auf Naxos
Zadek, Hopf, Jurinac, Streich; Keilberth. Köln, 1954
Verdi: Macbeth
Taddei, Shuard, Wildermann, Prevedi; Previtali. Buenos Aires, 1964
Verdi: Rigoletto
Glossop, Moffo, Cossutta, Guy, Rouleau; Solti. London, 1964
Verdi: Un Ballo in maschera
Cossutta, Ligendza, Wixell, Randová, Cuccaro; Maazel. Berlin, 1974
Wagner: Götterdämmerung
Ligendza, Cox, Ridderbusch, Mazura, Martin, Reynolds, Neidlinger; Stein. Bayreuth, 1972
Wagner: Tristan und Isolde
Ligendza, Windgassen, Hoffman, Frick, Neidlinger; C. Kleiber. Stuttgart, 1973