I said earlier that any song can become a folksong. Moving a rock composition to a single voice acoustic arrangement may be a step in the process. But more important would getting that song to become part of the collective repertoire of a community. "Take Me Out to the Ball Game" (at least the chorus) and "Rudolph the Red Nosed Reindeer" have both, in my opinion, become folksongs, even though both started as Tin Pan Alley creations. So have "Frosty the Snowman," "Yellow Submarine," "The Unicorn," and dozens of other songs that children learn in what is essentially a folkloric process.

--- Steve