Orchestral and symphonic pieces only. Singing is allowed so long as it's not the primary "instrument" (e.g. you can't pick a classic rock song, but you can pick a song from Halo with "chanting monks").
What's your pick? My second pick would be that theme that plays when Aragorn is being epic, but I'm not sure what it's called.
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I'm surprised this hasn't been posted yet. It's pretty incredible what John Williams can come up with. Old but gold.