Stacks is just dazzling the crowd with Ray Charles' Mess Around.
What in the hell is the material that Rooster's coat is made of?  Obviously, nothing naturally occurring in nature (unless it's a synthetic leopard).
Look at Chicken Shack, just pining to have a doo rag like T-Bone. Shortly after this picture was taken, the Shackster walked off the stage in a huff because he couldn't get a doo rag (but when he realized he left his bottle of Wild Turkey behind, he walked back on...).
Pops and Stacks give their rendition of Chuck Berry's You Never Can Tell (one of the many 'tell' we do - I Can Tell, Tell Me, You Never Can Tell, Somebody Tell Me, William Tell Overture, etc.)
We're sorry, we just had to have one more look at T-Bone in his doo rag.  He's always sooo special...