Sorry I can't reproduce anything with this save, the graphics are totally garbled when loading it, I don't know how you did that, but the game is not frozen, it still reacts to inputs, I can press a+b+c to get to full power but it has no effect on any music playing or not. After that a makes the final punch, victory, and still nothing happens for the music.
Ok, finally did it, there are random sounds playing, one of them stops the music, which gives us 2 more prefix commands, because I tested some more manually, and another test build. This one should be good everywhere, assuming it doesn't break things in the other games of this kind, but it shouldn't.
exp.7z