Thank you! I really like the Faust pieces (the Otello one not as much, although I love the lyrics). I was definitely wondering about the bit with the diabolical laughter, as it sounds technically difficult and I think it's great. I read a translation of the libretto for Gounod's Faust a while back, but hadn't heard the music.

I did recognize the "Toreador" bit. It's from a more recent album he put out, and I don't think his voice was what it once was due to his health. I like people who can do totally corny things like that with passion (seemingly a fairly common metal trait, so small wonder he gravitated toward metal in later life...). The rest you mentioned are apparently from an older album which includes a couple from Der Ring des Nibelungen. Sadly I can't find those on youtube.

Here he's singing more opera I cannot identify, in 1970. =D