Bonnie Boy has a curious analogue in The Grey Hawk, which I know primarily from the singing of Bob Roberts, although a very early live recording by the Strawbs turned up a few years back sounding like it was a well established revival favourite in the early 'sixties.

We've done Blackwaterside a few ways now; these days we do it with the banjo (high capo 7!) & fiddle but I still like our Instant Pop Folk version with Rapunzel singing with her electric guitar with me intruding on harmonium and trumpet - hear it on her Myspace Page.