Courtesy of BMM, here's a series of vids on Blues pioneers by Alexis Korner made 35 years ago; takes you from the early days to 60's Chicago--each episode is about 1/2 hour. Excellent series from a deeply committed musician--part of his legacy:
Episode 1 Series 2
Here's more on Mr. Korner:

Blues Music Magazine wasn't ripped off on this--they just pointed us to the material.