Chrono Trigger's "Singing Mountain" Music Patch

But I also don't see anyone talking about the labor they went through to make it...

A quick search points this out:
https://www.ff6hacking.com/forums/showth...60#pid6060
http://slickproductions.org/forum/index....6#msg14906

He changed one byte, but perhaps more if he went about it the wrong way.

Are you trying to disprove your own point? Yes, the end result was that he changed one byte, but looking at the very ForumSlickness thread you posted, it shows that he had to do quite a bit of trial and error to figure it out, even with Leno nudging him in the right direction.

...you know, I'm done with this.
Here's an xkcd strip. http://xkcd.com/386/