Just found Roger McGuinn's folk music site here. I wasn't aware, which in and of itself is nothing new, that Roger was involved in this kind of project . . . but much to my personal delight he is!
There are several other Folk Den pages related to this site, and I believe they are clearly linked.
Roger has done a 4 CD set of 100 folk songs, and I am going to give that a good look.
God's grace, and a good folk song, still amaze me . . . ><>