Gordon Jackson, thank you! That's it! A housemate of mine had that LP, back in the day. It was only years later that I learned to play the tune under the name "Sellinger's Round", and thought, "Oh yeah, I've heard a cool electric version of that." Then last night, (a fragment of) said version popped into my head and would not go away.

Apparently, that particular track cannot be heard on the internet for love nor money, so I'm going to have to defer my gratification and order the CD.