I recommend the soundtrack from Digital Devil Saga 2: Avatar Tuner (Mouthful I know). The game has a ton of amazing battle music and some pretty good background music with very few vocal tracks. I especially recommend the songs Battle for Survival and The Divine Entity. I also could recommend the soundtrack to the first Digital Devil Saga, but for me the second game's soundtrack is much better.
Here is a link to a website where you can download the songs in goodish quality for free, but I am not sure if it can be trusted. (though it might be one you have used several times by now. I don't know, I don't download game soundtracks often tough I really want to.)
http://downloads.khinsider.com/game-soundtracks/album/digital-devil-saga-avatar-tuner-2-soundtrack-cd