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"Viva La Diva!"| Kennedy Center

https://www.kennedy-center.org/education/resources-for-educators/classroom-resources/media-and-interactives/media/opera/viva-la-diva/

"Callas – La Divina (1992, CD)" - Discogs

https://www.discogs.com/release/2471965-Callas-La-Divina

Maria Callas - "Sempre Libera!" W. Alfredo Kraus (High C) - Lisbon, 1958 [Remastered Sound] - YouTube

https://m.youtube.com/watch?v=LmDAaUqTfI4&feature=youtu.be

English Translation of "Sempre Libera" from Verdi's "La Traviata"

https://www.liveabout.com/sempre-libera-lyrics-and-text-translation-724071

"Callas singing Sempre libera like a Wild Cat" - YouTube

https://m.youtube.com/watch?v=IK-1wQoC-jk&feature=youtu.be