Two objections: A) classical doesn't equal classical, and metal doesn't equal metal.
Of course, there's the obvious like Malmsteen or Rhoads or Emperor or much of melodic death metal who remind you of Bach or Vivaldi or Beethoven. Clearly that sort of heavy metal is closer related to classical music than any non-heavy metal modern music.
Then there's the pathos and flamboyance of Judas Priest, Iron Maiden or Manowar, heroes with swords and dragons and shit. That's pretty much Wagner. I think Manowar mentioned Wagner as the first heavy metaller.
But then for example, there's thrash metal and grindcore. I find it difficult to relate Slayer or Sodom or Napalm Death to anything classical, and I don't believe they are too well-versed in classical music anyway. Black Sabbath doesn't remind me much of classical music either.
And then, there's "classical" music that goes far beyond classic classical music. Stravinsky's Le Sacre du Printemps, my favourite classical piece, is thoroughly composed savagery. It's about a human sacrifice no less, it's much heavier and more brutal than most metal, and perhaps it's no coincidence that it debuted one year before WW1 where "civilised" Europe collapsed and met its savage end.
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Funny enough, the only stuff I can think of that comes close is apocalyptic black metal like Mayhem or Blut aus Nord. Maybe there's the full circle.
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