I just came across this thread and enjoyed the stories and seeing familiar names. Billy Vanaver seemed to disappear from New York City years ago after he & Livia got married. I heard about them performing and teaching in other areas. They will be appearing in New York City again November 16-18 in Eisteddfod-NY (see www.Eisteddfod-NY.org for details). Do come see them!
A number of the other people mentioned in this thread have appeared at Eisteddfod-NY in the last few years. I don't think of Andy Cohen as a little known singer from the past, since he is performing full time now and was the director of Folk Music Week at Pinewoods Camp (Country Dance & Song Society). He was a big hit at Eisteddfod-NY last year - blew away some high school students who were volunteering. Others mentioned above who've appeared at Eisteddfod-NY are Joe Elias, the Kossoy Sisters, Alan Friend, Hedy West, Steve Suffet, and Jeff Davis. Probably a few more.