Astos, Kraken, Lich, Beelzebub, Malboro, Iron Giant, Planktae, and Scylla didn't have to look at the party. Maybe they thought they were too good to make eye contact with the enemy, or just wanted to break the 4th wall.
If anyone is more motivated to do the music than I, the music RAM starts around $6E00.
$6E54 Square1 Note (??-3F)
$6E55 Square2 Note (??-3F)
$6E56 Triangle (?) Note
$6E57 Noise (?) Note
This will help you use the debugger to find where the notes from each stream are loaded from. I think $A2FB LDA's Square1 notes.
15, 1B, 27, 33, 3F are all for C notes, so you can figure out your scales from there.
I keep forgetting there are 2 battle themes; the random battle theme (FF2j battle theme), and the boss/scripted battle theme (FF3j boss theme (makes me think of dancing clowns somewhy)).
Edit: I haven't been able to rip a working NSF from the ROM.