I'd have to say most anything on the pipes and drums, but especially Scotland the Brave. Other than that, the RAF/RCAF March Past and the theme from The Magnificent Seven. Those stir my blood!
Anything with pipes, of course, but my favorite song right now is Dido, believe it or not. "Not So Bad". Great song, and wonderful use of harmonic variations. Good stuff. It's very mellow, though, and so I still can't figure why it stirs me.
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