I should also mention that there are at least two lists for those involved in the folk music business, such as artists, managers, agents, venues, etc.

I haven't subscribed (I got the information for a friend who is in that line of work) but the information I got from a perons on the lists was

send a message to

listserv@psuvm.psu.edu

with the notation in the BODY of the MESSAGE:

Subscribe Folkbiz

or

Subscribe FOLKVENU

depending which of the two you want. (If you want both, I assume that you'd have to do two separate messages.) I am informed that there is a list specific to Canada, and I wouldn't be surprised if there were ones specific to the UK and to the "Down Unders" as well.