Movie music identification post!

See, when I write, I always have my huge master playlist going on random--and yesterday, it popped up with this one track from the Fullmetal Alchemist OST that completely and utterly pinged with me--I stopped and thought, I have heard this song before.

Or, rather, not THAT song exactly, but one that sounds EXTRAORDINARILY like it. There's seriously maybe only a handful of differences in the overall melody, and it's driving me nuts, because I can SEE the credits in my head, and they're kind of dark and gothic-y (or maybe that's just my brain, extrapolating from the feel of the song itself), and yeah. >______> I was trying to explain it to friends last night, since pretty much EVERYONE I know has seen more movies than I have--but I couldn't sing the melody, and therefore identification still eluded me.

So if anyone out there can take a listen (it's track 18, "Hisou") and see if THEY can identify what movie opening it sounds like, I'd be very grateful. I could, I dunno, roll over and do stupid cat tricks, write you something, whatever. XD;

It's kind of like having a song stuck in your head, but you only know maybe three words of the chorus. HELP. T_T