Andrew Jones Jr. is the guitarist on the great song above.
From Wikipedia’s entry on harmonic player Charlie Musselwhite:
His family considered it normal to play music, with his father playing guitar and harmonica, his mother playing piano, and a relative who was a one-man band. At the age of three, Musselwhite moved to Memphis, Tennessee. When he was a teenager, Memphis experienced the period when rockabilly, western swing, and electric blues and other forms of African American music were combining to give birth to rock and roll. The period featured Elvis Presley, Jerry Lee Lewis, and Johnny Cash, as well as lesser known musicians such as Gus Cannon, Furry Lewis, Will Shade, and Johnny Burnette. Musselwhite supported himself by digging ditches, laying concrete and running moonshine in a 1950 Lincoln automobile. This environment was Musselwhite’s school for music as well as life, and he acquired the nickname “Memphis Charlie.”
The entry says that Musselwhite is of Native American dissent and that Dan Ackroyd’s Elwood Blues was modeled on him.
If Ackroyd really copied Musselwhite — after all, both are harmonica players who carried (I think we’ve seen the last of Elwood) their harps in a briefcase — it’s interesting to consider if such portrayals are rip offs or affectionate and respectful caricatures that do as much for the subject as the star. I believe in this case it’s the latter.