Just checked my previous list, and I'm glad to see my musical taste hasn't really changed in around a year.
Let's take another general look:
1. Wagner:
Tristan und Isolde. My favorite by far, and I don't think this will change. Everything about it is just awesome.
2. Puccini:
La Boheme. Once one of my least favorite composers, I realize now I had just listened to too many poor renditions of Nessun Dorma (Paul Potts take notice). Really a great opera, and superb music.
3. Britten:
Peter Grimes. Great action in this opera, very realistic. I love the music and singing, too.
4. Berg:
Lulu. I really love this opera. I am a huge fan of 20th century opera, especially 12-tone music. I actually really respect 12-tone composers. The music of
Lulu can be quite beautiful and poignant, but I love it more for the chaotic and exciting moments.
5. Wagner:
Parsifal. Still one of my favorites. Awesome music, really sets the tone of the opera.
I love Prokofiev, Shostakovich, Schoenberg, Bartok, Rimsky-Korsakov, Poulenc, Hartmann, Dallapiccola, Raff, and Bruckner as well. They're proabably on the next 10 list.
As for my least favorites I'll just say that I really don't like Brahms, John Adams, Dvorak, and Grieg. Their music really just doesn't do it for me.