Dick, class is important in all sorts of contexts and folk music is no exception.

If you go around saying/writing that the folk scene is 90% middle class then either you have done some research to this effect or you have read someone else's research which says that. I can't believe you would write something like that without basing it on solid research.

All I am wondering is where the research is located.

Trust me on this one Dick, there would be lots of people interested in this research, whoever did it.