Final Fantasy Mystic Quest...

[Dice]

...battle & boss theme!!

For an SNES and for over ten years, I always thought these themes were pretty damn intense. The game might not have been extraordinary, but these were always a joy to listen to. =p

[Chickenwarlord]

This will probably have something along those lines.
http://ffmq.olremix.org/
Be warned, OLRemixes are totally different qualitatively than OCRemixes.

[Rexy]

Ashane covered the battle theme if you want that. (http://housethegrate.powweb.com/ashane/audio/Ashane-04.07-FFMQ-Red.Cap.Assault.mp3) It was in the Dwelling of Duels May/June 2004 Free Month.