Sacred Harp and "Awake My Soul"

I feel as though I stumbled across a treasure last night while flipping channels. There was a documentary on PBS titled "Awake My Soul: The Story of Sacred Harp" (http://awakemysoul.com/). The documentary discusses the old southern hymnal, Sacred Harp, and shape-note singing. I had once heard of shape note singing a few years ago, but never had a chance to listen to it until last night. One of the men on the documentary put it well: "it is like a wall of sound." The best part of the show was definitely when the narrator mentioned the music's style in relation to the more aesthetically pleasing Southern Gospel music that would come to replace it in the South: "the critics and cities felt that the Sacred Harp was uncivilized because it preached nothing other than Christ crucified." Watching the documentary last night made me want to find one of these "singings" here in North Carolina...

Here's a video of the documentary's trailer and another video below it of an example of such a singing (as you can see, anyone can lead!)