I've always been curious about what defines a "folk" song as opposed to a "pop song on acoustic guitar" - and it appears that it's generally an old
The term, Folk Song, originally meant songs that were so old that no one remembered who wrote them. It was pretty clear cut.
However time has transmorgified the meaning, and it's now generally refers to an artist on an acoustic guitar, although when I went to the Wikipedia page on it, there was a whole different definition, including differing countries traditional and folk songs:
https://en.wikipedia.org/wiki/Folk_music
So, after that research ... I still don't know
Cheers
Richard