USHER with Foo Fighters, John Legend, Tom Petty and the Heartbreakers, Heart, Rush, Don Henley, Tom Morello, Jackson Browne, Carole King, Chris Cornell, Run–D.M.C., Randy Newman, Public Enemy, Quincy Jones, Gary Clark Jr., Jerry Cantrell, Mike McCready, Booker T., Jennifer Hudson, Lou Adler and John Mayer