Not sure it’s the same Casta Diva but a German friend recently described that as ‘A gay guide to opera’ focusing on Maria Callas. I wouldn’t be surprised given a number of (excuse me being blunt) opera queens I’ve known were utterly obsessed with old custard mouth - er - sorry, Ms Callas.
Well there are just as many opera queens, maybe more, who are as obsessed with old no words Joan Sutherland, but unfortunately some of these books that focus on the glamorous Callas persona and her rather tempestuous personal life do her a disservice, as, regardless of what you think of her voice, she was one of the greatest
musicians of the last century, admired by a great many famous conductors and instrumentalists, among them Karajan, Giulini, Bernstein, Erich Kleiber, Serafin, De Sabata, Gui, Victoria Mullova and Claudio Arrau, who would make his students listen to records of Callas singing Bellini to help them in their understanding of how to play Chopin.
As Victor De Sabata once said to Walter Legge,
If the public could understand, as we do, how deeply and utterly musical Callas is, they would be stunned.
Maybe I'm one of those rare opera queens who has always rated musicianship and intelligence above voice, and actually, up until at least the mid 1950s, Callas's voice was an exceptionally limpid and responsive instrument, which enabled her to render the score with an accuracy most singers could only dream of, and I'm not just talking about the notes, but the expression marks the composer put into those notes.
Inicidentally I've never quite understood the criticisms of "custard mouth" and the like, as I loved the sound of her voice from when I first started listening to opera in my teens. Age and maturity has only deepened my admiration and wonder.