Voices of the century: Videos of Jussi Bjorling, Maria Callas, Leontyne Price and others

We covered a lot of music at my class, March 25, and I'm sorry we didn't get to everything I had prepared. The class felt a little rushed and I'm sorry we didn't spend more time discussing each performance. Next time, I'll reduce the number of performers.

Here are all 16 of the performances I had planned to share with you. We heard two singers perform the same aria so we could compare voices, personalities and musical styles, and we explored how each singer acted with his or her voice. We had to skip Nos. 9 and 10, Fritz Wunderlich and Francisco Araiza in "Dies Bildnis" from Mozart's "The Magic Flute," and Nos. 13 and 14, Gerald Finley and Dietrich Henschel singing "Batter My Heart" from "Dr. Atomic" by John Adams. And we listened to only a few moments of Nos. 15 and 16, Barbara Hannigan and Audrey Luna, in Gyorgy Ligeti's "Le Grand Macabre."

Enjoy, and I'll see you April 29 for folk-inspired music. Many composers, from Mozart, Chopin and Brahms to Bartok, Astor Piazzolla and Osvaldo Golijov, found inspiration in folk music, transforming their work while keeping it grounded in the classical tradition.

Jon Vickers, above. Peter Pears, below. The aria for Pears begins at 45:08.