Dawn, since you really like the Incredible String Band and William Eaton, I thought you should check out the following groups.
For "The Roots "of this music these 3 CD's are among the best, Terpischore, and Country Capers both with The New York Renaissance Band with Sally Logemann, and English Country Dances,with David Douglass, Paul O' Dette and Andrew Lawrence- King. If you can't find them at Amazon, Arkive Music.com ( I think I live there)will have them.
For music in the vain of William Eaton, try Metamora ( I met members of the group in the early 80's )and Trapezoid. I like Trapezoids earlier albums better than some of the later ones.