For the third year in a row, Willie Nelson and pals will be heading back to Austin, Texas, for Willie’s 44th annual Fourth of July Picnic. More than a dozen acts will join Willie, including Sheryl Crow, Kacey Musgraves, Jamey Johnson, Steve Earle, Margo Price, Asleep at the Wheel, Turnpike Troubadours, Hayes Carll, Ray Wylie…