"It is become increasingly clear that discussion with you gets nowhere"
That's a two-way street as far as I am concerned Vic (I'm sorry to say)
I am endeavoring to respond to every one of your points - you are responding to none of mine
THat I believe is the cause of your "circles"
We obviously don't agree on definitions - when I suggest that you believe the music hall songs are out of the same stable as our folk songs which you appear to be not unique, you appear to tale umbridge   
Me
"Now, it seems, there is nothing about folk songs that set them apart from other songs
You
"Are you suggesting that I am saying that"
If that is not what you are saying - what are you saying exactly
I answer your point to the best of my ability and ask you for clarification
In return I get another question
What you are appearing to be looking for is abject surrender

You are the people who have changed the rules and moved the goalposts - it is up to you to justify your tectonic shift I've got my experience and my library to keep me warm

If you are not prepared yto respond tto my points I don't want to talk to you either - we can agree on that at least
Jim