My apologies the "churlish" guest above was me.

cnd, I am pretty sure that if you take a look at You Tube you would be able to find some of what you are looking for. Alternatively you could try finding a copy of the double CD issued on the Columbia Roots 'n' Blues series 472886 2 titled "White Country Blues (1926-1938)",48 tracks including the two referred to by Mike Yates above. Unfortunately the performer's dates of birth are not shown but hopefully that won't spoil things.

A similar double CD was issued in the UK on the Indigo label with 50 tracks "Drunk & Nutty - Hillbillies Foolin' With the Blues". Without checking I seem to remember that many of the tracks appear on both labels

Re black musicians yodelling, not very common but it did happen. There was much more crossing over of styles and "borrowing" than we once believed. Try Howling Wolf's "Smokestack Lightning". And of course Jimmy Rogers wasn't the first.

Regarding Blind Lemon and One Kind Favour. Was he the first to use that tune? I have heard the song "Careless Love" sung to this tune.