One of the first things I get excited about when I start playing a new RPG is the battle theme.
Whenever I come across a great battle theme, I'm almost never disappointed by the game. Great battle music is always a sign of an awesome game for me. There are some really badass ones out there, and I'd like to see what you consider your favorites.
Some of mine are:
Golden Sun - http://www.youtube.com/watch?v=YFMc40qxJK4
Chrono Trigger- http://www.youtube.com/watch?v=xeNkqEOQ15I
Final Fantasy IV- http://www.youtube.com/watch?v=IGJN7JL3Daw
Lost Odyssey= http://www.youtube.com/watch?v=CzM5GeeLjJ8