I have argued that all music is born from traditional process, and all idioms are traditional by definition which is a different thing. The psuedo folk song is written at some remove from The Tradition in mimicry of an idiom in order (generally) to prove a point - social, political or otherwise. Not wishing to complicate matters, it seems there is a long tradition of writing psuedo folk songs - hell, even Henry Purcell was at it in King Arthur with 'Your Hay it is Mow'd & Your Corn is Reap'd'!