'Mikefule' has obviously decided that the song he refers to IS folk - now he wants someone else (preferably an 'expert' or 'authority') to agree with him and to take responsibility for his decision.

Please have the courage of your convictions, Mr 'Mikefule', if you think it's folk, you call it folk - but don't automatically expect that everyone else is going to fall into line and equally automatically agree with your decision.

Alternatively, if you're disatisfied with that outcome, why don't you do the research and read the books (you'll find them listed on this site as well as others)? It's ultimately down to you to decide.