ROOTS REVIVAL—Robert Plant and Alison Krauss drew one of the Bonnaroo Music & Arts Festival’s largest crowds this year with a stirring set including material from their debut collaboration Raising Sand. Plant kicked things off minus Krauss with a backing band featuring T-Bone Burnett. Things took a progressively country turn when Krauss stepped onstage, adding her ethereal vocals and signature fiddle sound to songs including “Sister Rosetta Goes Before Us.”? “Welcome to our little world,”? Plant told the crowd. “It’s a great pleasure to bring this gift.”? Shure hardwired microphones were used by both artists, an SM58 for Plant and a Beta 58 for Krauss.