I'm refreshing this because I think it's an important document--if only a documentation of how one branch (the commercial one) of American folk music evolved. It's certainly not all-inclusive...it's hard for me to agree that R&R wiped out folk music, until it was resurrected by folk-rock. But it's a fine summary of how one branch of folk music developed and withered.

Now, if someone would do something similar for some other aspects of folksong---remember, Folk-Legacy started just about the time that pop-folk was taking off, but followed a distinctly different path.