yes, next stop Weenie Campbell - I'm a little overwhelmed right now, trying to make contact with critics, etc.
as for the variety of tunes - almost everything on the set is from my own collection, LP, CD, 78, etc. I don't really know how I did it, but the current mess in my basement is a sign that I was there and gone. I basically went through everything I own, and spent maybe an additional $1500 on materials (I know this figure is close, since I am doing my taxes this week).
I did a little shopping at Stereo Jacks (where I was fortunate to snap up a pile of LPs from a recently-deceased collector; also, my local used record store had some choice things - for example - a Savoy LP reissue of John Lee Hooker which was so much better sounding than the CD versions that it was both laughable and scandalous). I've been somewhat on top of the whole blues reissue thing the last 15 years, have snapped everything up that I could, as well as grabbing vanishing LPs with good sound (especially French black and whites, RCA/BMGs, Columbia/EMIs, et al). Sources are of prime importance, of course, as a good source makes any restoration engineer sound like a genius (I took the King Oliver from a very good-sounding 10 inch Columbia). Of course, there was also Document, of which I own a lot, and they are not as bad as they are purported to be, sound-wise (in many cases I could tell they had used LP transfers from decent vinyl).
I tried to put some out-of-the-way things on it, too - there's a Charlies Ives solo piano piece coming up, an Aaron Copeland piece (called blues but very far from it) and even a Harry Partch spoken word, put there since Partch had a lot to say on the relationship between American speech and American vernacular music. And, most happily of all, the set ends with a Jaki Byard solo.
as for the hardcore blues guys, it will be interesting - even true experts like Paul Oliver show a deep misunderstanding of, for one example, Ethel Waters, and I tried to deal with this. I also have a greater sympathy for the whole minstrel ethos than most critics, and I did my best to include and explain.
Most frustrating is when I find things that I think I should have included - like more post-War acoustic things, or some more on the Popular Front (though I do have Woody Guthrie/Cisco Houston, Josh White, and Sonny Terry, Brownie McGhee, Leadbelly - I just should have engaged with the subject in greater detail).