i recommend seeing these movies for ideas...and you might include a
Shape Note Song...see sacred harp music
Oh Brother Where art thou...
High Lonesome sound-by John Cohen
High Lonesome by Rachel Liebling
http://video.barnesandnoble.com/search/product.asp?ean=755362060499&pwb=1
Song Catcher
Cold Mountain...Tim Ericksen was the music Director, i believe.
http://www.coldmountainmovie.com/
look up music by these folks:
Roscoe Holcomb
Bascom Lamar Lunsford
http://www.amazon.com/exec/obidos/tg/detail/-/B000001DK0/102-6229915-1319334?v=glance