I missed this the first time around, so I am happy to see it revived. Dale has already provided the pertinent information about Comer "Moon" Mullins who is also a National Thumbpicking Guitar Champion and who has a number of recordings available from the Ozark Folk Center in Mountain View, AR. I think Elmer is on one of those recordings, but will have to check. Everyone whom I heard do the song got it from Comer.