Okay, instead of editing my last entry, I figured I'd just explain myself in a new one.
I think what really meant to say wasnt "shape note singing", its not the notation that fascinates nor puzzles me; I can sing according to square notes! I was referring to the haunting sound produced, the actual style of singing. I suppose its worth remembering that most "folk music" in the world is atonal to our ears, as if we've been spoiled by the compositions of J.S. Bach.
At any rate, here is a little sample, for those unacquainted; its the trailer from a documentary made last year.
Click to view
Yeah, this is definitely my obsession for the moment...