Roger,I agree that deciphering the lyrics of old blues can be a bit hit or miss at times. Canned Heat also nicked the tune and panpipes instumental of Henry Thomas' 'Bull Doze Blues' for their hit 'Going up the Country'. Blind Owl Wilson had a vast knowledge of the blues and Bob Hite had a legendary collection.
Unfortunately, I do not play any instrument - my youngest son is the musician in our family. I recite Australian bush ballads and other poetry, but that is the extent of my performance contribution to the folk scene.
Regards, Stewie.