Tenor Juan Diego Flórez, earned the first solo encore at the Met Opera since 1994, by hitting 9 high C's during his performance in “La Fille du Régiment.” This is one of the most famous and notoriously difficult tenor arias in the opera canon. About 10 years ago, I had the good fortune to hear Pavoratti himself perform this aria on the Met stage during a rehearsal. It was absolutely stunning, and even more exciting because Pavoratti blew it on opening night of that production. The NYTimes has an article all about the historic evening, and even better an mp3 of the Flórez's stunning performance. I strongly suggest you give it a listen. (via Kottke)