I was fortunate to catch her at the end of her career at a concert at Miami Beach's auditorium. [1973?] It was a mixed blessing, though. She had lost her voice but not her dieted-down figure.
There was a lot of screeching (I know this is horribly disrespectful as she died not too long after I heard her), and her performance was deserving of pity.
She performed with Giuseppe Di Stefano, with whom, it was rumored at the time, she was having an affair.
Her famous line was: "First I lost weight, then I lost my voice, and now I've lost Onassis."
Yes, Onassis should not have dumped Maria for Jackie, whom he later faulted for all his losses -- especially the loss of his precious son, Alexander. He called Jackie "the witch" in Greek.
Add-on: The concert was March 21, 1974, and Callas died in September 1977. Miami Beach was one of the stops on what was to be her final world tour.
MIAMI BEACH
Auditorium
21 March 1974
Maria Callas and Giuseppe di Stefano
Robert Sutherland, accompanist
Quale, o prode, al tuo coraggio, I vespri siciliani
Suicidio!, La gioconda
Vainement, ma bien-aimée, Le roi d’Ys
L’amour est un oiseau rebelle (Habanera), Carmen
C’est toi? C’est moi, Carmen
Io vengo a domandar, Don Carlo
Voi lo sapete, Cavalleria rusticana
Tu qui, Santuzza? ... Ah ! Lo vedi ... No, no Turiddu, Cavalleria rusticana
O mio babbino caro, Gianni Schicchi