This is interesting stuff. I loved skiffle back in the fifties, and listened to Lonnie Donegan, the Vipers, Chas McDevitt and Nancy Whisky etc. Since getting into Apallachian Old Time music, I've realised where a lot of the songs came from -"Don't You Rock Me Daddy Oh" was Uncle Dave Macon's "Sail Away Ladies". Donegan used to do "Cumberland Gap" and "John Henry" as well as other old time tunes. His other main influence seemed to be Leadbelly. Cheers Ray