I can think of a very good point Calt made imo (remembered roughly): the black folk blues songs with lyrics about I don't have a mother I don't have a sister what am I going to do were correlated with begging for money from white people on the street in contrast to the lyrics of a huge number of other black folk blues songs that had different topics, such as bragging that your woman would go your bail whenever you wanted. He was being cynical as usual, but in this case I think that cynicism led him to the wise, historical conclusion.

I can't think of a second one.

I love Patton's "Green River Blues," for instance, but I think Patton's overrated in general. I think Peg Leg Howell is one of the early-style greats, e.g. his '20s version of "Skin Game Blues."