Hear That Long Snake Moan part 1
From where do they spring? Read on! This is one of the best cultural histories I have ever read, and is extremely enjoyable.
It's long out of print, but seems to be required reading in a number of college courses, based on a Google search. I scanned the first half some time ago and present it here (look in the comments at the bottom of this post for the text, as I have not yet perfected my FTP skills).
I'd be happy to scan the second half (bringing it to the modern day) if anyone were to ask.