Helen wrote: "One of the assertions in part 1... was that jazz music was doing well commercially for white audiences but most of the commercial interest was in happy & upbeat songs. On the other hand, the African-American musicians themselves played and sang the blues in their own social circles as an expression of their sadness and the difficulty of their lives while living in a society which was still prejudiced against them."

The music that eventually became known as "jazz" developed in New Orleans, mostly among black musicians, and was dance music, fun music, mostly for black audiences early on. A typical type of tune played by a black New Orleans dance band in about 1908-1911 would be "High Society." Typical blues lyrics from about 1908-1911 would be, as you say, along the lines of the version of "All Out And Down" Mance Lipscomb heard, the "Knife-Song" Howard Odum heard ("... I got the blues.... That woman will be the death of me..."), the variant of "Poor Boy Long Ways From Home" Emmet Kennedy heard, etc. Sad, and typically involving male-female relationships.