Matt McGuinn turned that joke into a wonderful song, Grigaloo, which I'm happy to see is also in the DT. It's on Gordon Bok's collection, "The February Tapes" (vol. I), and I'm not sure who else has recorded it.

Possibly true thread creep: Matt had been mostly known for writing parodies and funny songs, and then wrote the lovely song, "The Rolling Hills of the Border". Apparently he was somewhat chagrined when John Roberts and Tony Barrand turned that into the classic parody, "The Rolling Mills of New Jersey."

Aloha,
Mark