Hey Art, congrats on getting the CD out! The tune to Master of the Sheepfold is very similar to the one I know, and I learned it with just a little black dialect in it (Massah; brung in; gloomin' nightpath) from my college friend Charlie Ipcar who lived on an island near Bath, Maine, (Robinhood Cove) and I'll bet money he learned it from Bill Bonyun. Charlie actually sang highland shepherd, not hireling,which is what happens when you have an oral tradition.
Blessings,
Barbara