Gary Clark, Jr. and William Bell know enough about blues and soul to bring some grit to the Grammy stage. Of course, Clark is one of the most famous blues guitarists in the world today; and Bell is one of the most beloved southern soul singers of all time. That's a lot of heart and truth between two of our most revered artists.

The pair took the stage together to perform the Albert King classic "Born Under A Bad Sign," which was written by Bell. King, the legendary blues guitarist, recorded for Stax Records when Bell was one of the premiere artists for the label.

With Bell singing most of the lead as Clark played screaming blues licks on his six-string, "...Bad Sign" brought the jook joint to the 59th Annual Grammys.

Grammys 2017: The Hottest Looks From the Red Carpet [PHOTOS]