Guthrie may be right that Pete Seeger was the first to coin the term "folk process", but the process of oral song-transmission through through variation and selection was being analyzed even before Pete Seeger's birth in 1919. And the process itself has been operating as long as there have been songs. The folk process was described, though not so named, by Cecil Sharp in 1907: "[Development of a folk song] involves the three principles of continuity, variation, and selection."Link
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.