If you listen to early examples of both, you will find they are entwined past (I suspect) anyone's ability to delineate their relationship. Suffice to say-- we weren't there, so what can we really know?

It's all there to enjoy, immerse oneself in, be moved by, learn from.....

The rest? I wouldn't touch it with a ten-foot pole, any more than I would try to describe "what is folk music".

~Susan