A great biography of the “other” Johnson, Lonnie, from Blues Town. While the boxed set reviewed emphasizes Johnson’s guitar talent, he was also quite a supple vocalist and had arguably the steadiest long-term career of any of the pre-war bluesmen.
BLUES TOWN (The City Of Blues)

A compelling photo essay with audio commentary portraying Chicago during the years 1946-48, with a blues soundtrack, and photos from Bronzeville taken by Wayne Miller.
Chicago 1946 – 48 | Magnum in Motion

An engagingly detailed historical / biographical account of country bluesman King Solomon Hill, from Big Road Blues.
A Walk Up King Solomon Hill » Big Road Blues

I had a blast going through this interactive map. As a lifelong Chicago resident, many of the locations in the Blues Brothers movie are quite familiar, but in a hazy “where is that?” sort of way. Since I also conduct the occasional Blues History tour, this is a valuable resource as well. Take a peek, and weep for a minute over the loss of Nate’s deli and Maxwell Street…
The Blues Brothers – Chicago Filming Locations