Biddinger said:
What about something like Kayo Dot? Like "The Manifold Curiosity". It's got that huge buildup into the metal riffing.
Yeah, Kayo Dot might be your best try, unless he considers Jazz crap too. There's definitely nothing approaching Beethoven maturity in Opeth.
AS FOR PAIN OF SALVATION
I actually played In the Flesh for a jazz professor once. He liked the production, and part of that instrumental section in the middle with the weird time sigs that rules. Otherwise he said it was pretty lame.
OPETH has NOTHING approaching musically mature in the classical ideals of the word. I'm not trying to be a jackass, it's just a fact...their songs are mostly riff collages and weren't written with any ideas of functional harmony or anything. If your teacher's into beethoven, he probably wouldn't like anything that's atonal (or even approaching atonal)...if he's into stuff more like mid-period Debussy then you have a chance with the Opeth maybe cause Debussy also didn't use "FUNCTIONAL" harmonies and did stuff for the way it sounds. If you REALLY REALLY WANT to use Opeth, you should try doing something off Still Life like Godhead's Lament, that one maintains a sense of cohesion (unlike many of their other songs!). Anything off Orchid or Morningrise would be an absolutely awful idea, ESPECIALLY Black Rose Immortal. Actually TO BID YOU FAREWELL has a tiny chance of working, but I'd guess that wouldn't be METAL enough.
Honestly, though, I think you're completely screwed. The Kayo Dot is probably your best bet (and not if he doesn't respect jazz!), and that Agalloch song is EXTREMELY SIMPLE harmonically so that would probably be bad. It at least sounds semi-mature, but it's mature in a way that would probably say to him "WE THINK WE'RE MAKING MATURE GOOD MUSIC BUT WE HAVE NO IDEA HOW TO."
All those neo-classical/melodic death bands would be a TERRIBLE idea honestly, they're so damn cheesy and their chord progressions are incredibly cheap. Symphony X also wouldn't work, I'm sure, especially not if you played one of those songs with the videogame style keyboard "orchestration."
I wish I'd seen this thread WAY EARLIER.
EDIT: I actually read the whole thread now, SO my message is totally worthless. That's a great story!