Nobody seems to have noticed previously (ahem!) that the classic "jody" tune is essentially that of "The Marrowbone Itch," an odd little song collected by the Lomaxes from Mike Brock (guitar acc. by Farmer Collett) at Middle Fork, Leslie Co., Ky., in 1937. It's in John A. Lomax & Alan Lomax, Our Singing Country (N.Y.: Macmillan, 1940), pp. 110-11. The tune is also used for "Hambone," in Wayne Erbsen's booklet "Front Porch Favorites," p.22.