Watch the Rainy Weekday online guitar lesson by Corey Congilio from Blues Guitar Fakebook: Rhythm Vol. 1
Perhaps the most famous slow blues song of all time is "Stormy Monday". "Rainy Weekday" takes its changes from the T-Bone Walker version and the Allman Bros Band version. I put these two together because you'll most likely hear these versions on blues gigs. Spend a good amount of time on the back half of this progression as there are some changes you may not be as familiar with. This is a staple of all blues setlists, so learn this ASAP!