what and where can I find the music from this Onimusha 3 trailer.

here the trailer.

http://www.youtube.com/watch?v=UMxUzV_VNmA

I'm probably being Captain Obvious right now,but I assume you've checked the OST,right?

I found a version of it on the soundtrack, but I was wondering if that music came from somewhere else. Like a classic music song.