Earl, I can't imagine that exclusivity is a trait of a true folk song. I think the song becomes part of all who treasure it. It not only expresses community - it builds community among all who share the treasure.
A true folk song is an organic, living thing. It contines to grow and change, but it carries with it all it has been through in the past. "Static" and "archaic" are other traits that don't fit folk songs. Folk songs stem from history and tradition; but they must progress with time, or they will die.
-Joe Offer-