I seem to remember reading that Alan Lomax both discovered, and wrote a biography of, a famous Jazzman. I think that it was Jelly Roll Morton - but could be wrong.

In my home town, in the late 50s/early 60s, it was the Jazz fans who started the first Folk Club. They, obviously, enjoyed both types of music but, in their wisdom, decided to keep the separate - a decision that I agree with.