DrumUltimA, thanks for the input. I'm not working on that now, but I'll be sure to consider it when I do. I would like to know though, what kind of swing beat would be more appropriate? I originally attempted using 3:1 (3 quarter note, 1 quarter note) and switched to what I'm using now, 2:1 (2 triplet, 1 triplet).
Anyway, here's a new revision. I took out the marimba entirely (you probably didn't even notice it in the first place) and, more noticeably, gave the trumpet a bit more melody parts and switched around a bit in the steel drum and flute tracks. No effort so far in the MIDI department; I think I'll wait until I get the score down to work on the sound quality. As usual, though, anybody is welcome to take the FLP file and toy with it.
http://zenixstudios.com/f/lastbattle1961f.mp3