It's a 12-bar blues using 4/4 triplet time (or 12/8 depending on your point of view) with a slight twist: the 12-bar sequences are divided into sections of 8 bars then 4 bars. It also starts and ends on the classic blues intro/outro.
HD download doesn't have any reverb on it so please add if you want.
"If only Wikiloops was around when I was younger, I would be a lot richer as a musician. I,ts great to share. Thanks Wikiloops."