The artist currently known as Johnny Blue Skies added guitar on a cover of Motown classic "I Heard It Through the Grapevine." The Black Keys on Thursday welcomed a very special guest during their first of two U.S. tour-closing shows at The Pinnacle in Nashville: Sturgill Simpson. The Black Keys will then return to North America in October for another nine-date stretch. Find a list of the group’s upcoming tour dates and corresponding ticketing details here. Find a list of his upcoming tour dates and ticketing details here.