I suspect it's origins are deeper than that...

But filk music, is the tool of the devil... 98% of it is crap... occasionally there's one that witty, and has a broad appeal, but most are either just lowbrow stupid puns (the absolute lowest form of humour if you call that humour at all) or are so thick with 'in' references that, if yer not up to your eyes in the subject matter, you'll never get it...

So you're right! It IS folk music after all!!!

LOL!!!!