'Little Angel Child' - Pinetop Perkins

Pinetop Perkins was a legendary blues pianist, closely associated with Muddy Waters (he played with his band from the late 60's until Muddy's death in 1983). Pinetop was also a highly succussful solo artist who played the blues until his death at the age of 97 in 2011, just a month after receiving a Grammy award for Best Traditional Blues Album.

Here's a rare tune called "Little Angel Child" from 1978: