Music Player

Could this be expanded to include an option to temporarily change or disable the map or default battle song as well?

Just replacing 24 (first entry) by FF here should do the trick. The other more tedious way is edit every regular formation. For randomness, see this thread.

Code:

C2/BF3B: 24 (Battle Theme)
C2/BF3C: 14 (Boss Theme)      
C2/BF3D: 33 (Atma Weapon)
C2/BF3E: 2E (Returner)        
C2/BF3F: 1A (Factory)          
C2/BF40: 3B (Final)          
C2/BF41: FF (current 1)
C2/BF42: FF (current 2)

Okay, I'm definitely confused here. My understanding is that the hack adds a music box that plays a song of your choice while in the menu.

I'm guessing that replacing 24 with FF makes the basic battle formation song play whatever you've chosen in the music box menu. Is that what you are suggesting?

What I was proposing was that in addition to playing in the menu the song would continue in play when you exit the menu and into battle until it was cued to change up by either entering a new area or until cued to change based on an event or battle with a special musical theme. Does this make sense?