He’s 91, so it’s not totally unexpected. Willie Nelson is having to push back his appearances at his own “Outlaw Music Festival” on doctor’s orders. In a message on his official Instagram account, it was announced that Willie wasn’t feeling well, and would be taking four days off, while Lukas Nelson & The Family Band would be performing a set of Willie standards in his absence. The tour will go on as scheduled, with Bob Dylan, Robert Plant & Alison Krauss and Celisse all playing as scheduled while fans and tourmates await Willie’s recovery and return to the tour.