Quite a lot...
Ayreon, Becoming the Archetype, Blind Guardian, Cynic, Demon Hunter, Dream Theater, Extol, Killswitch Engage, Opeth, Orphaned Land, Symphony X, Thrice...those are some of the metal bands I like.
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Official diagnosis: ADHD, synesthesia. Aspie quiz result (unofficial test): Like Frodo--I'm a halfling?
110/200 NT, 109/200 Aspie.