pacnsacdave has repaired the music from back to the future. the game developers accidentally released the game with the music sped up and didnt notice it before release somehow. you can grab it at http://pacnsacdave.weebly.com/
that is the crux of the debate, yessir. somebody's gotta contact brian post and ask wtf was going on. my moneys on 50/60hz fuckery and overlooking the code above anything else but maybe he could give us some input.
Aw, .nsfe has been a huge part of my life as a listener of music in general, and an organized, tidy file format for NES music was really a game changer for inspiring me to pretty much only listening to NES music ever (including "regular" music) before discovering the various Japanese computer systems.