there was a scene in the Movie Cold Mountain where they were doing shape note singing or sacred harp singing.
there is sacred harp history on the dvd...
Tim Ericksen, of Cordelia's Dad folk group was involved
in some of the sound track : http://www.greenmanreview.com/cordeliasdad.html
http://www.theoldtimes.com/past/1201_3.html
http://www.timeriksen.net/news/latimesarticlenov03.html