I'v just been reading this thread, and though I have nothing in the way of information to add. At the beginning of the discussion Jeri and Charley appear to be speaking critically of Forbitter's use of dialect in their recording. I don't know which performance you heard but I'v known those guy's for 20 years or more, and of the 4 of them I'v never heard anyone singing in a fake or phony accent or dialect.