Some others (my arch nemesis put up the Eternal Sonata one I was going to put up too >=( But all of these I have playing in FFXI too like the Valkyrie Profile one is my Odin music =3 )
^ Probably one of my favourite pieces of music ever just due to the fact I adore that game. Oh and the wyvern used to knock the crap out of me as I'm trying not to panic and chain.
And possibly, in my opinion, the best battle music ever conceived:
-The Valedictory Elegy ~Guitar Version~-
All from the original, in game soundtracks of their respective games. These two titles have an incredible soundtrack. It's unfortunate the games were so obscure that no one has ever heard of them.
I've played a lot of these rpgs that have been mentioned in this topic and I don't think anything comes close to Battle for Everyone's Souls in Persona 3. It's such a cool song because it incorporates a lot of the the music previously used in the game into one song. It's not very well known game even though it won best rpg game of the year (for lolps2), but it's definitely my favorite game of all time. Persona 4 is just as good.