OK, I'm shaping up on my own, this is the music thread not the where are you from or the childhood memories thread.
Let me mention some more favorite performances of classics.
Scott mentioned Debussy's Pelleas and Melisande. I love what I think was the first recording of this, Roger Desormiere from 1940's France, with the wonderful Irene Joachim and Jacques Jansen.
Someone else mentioned the Verdi Requiem. There are a number of great recordings of this but my favorite is conducted by Sir John Barbirolli, with, notably, Montserrat Caballe and Jon Vickers. Incredibly, I'm not sure you can buy that now, I don't see it on Arkiv Music which has one of the best organized and easiest to use lists. But you can get the one conducted by Carlo Maria Giulini in EMI's Great Recordings of the Century series. It features Elisabeth Schwarzkopf and Christa Ludwig, along with Nicolai Gedda and Nicolai Ghiaurov.