Earlier this year, a bunch of Johnny Cash's friends and famous fans got together in Austin to celebrate what would have been the legendary country singer's 80th birthday. They ran through many of his best-known songs, mostly in Cash's signature style. We Walk the Line: A Celebration of the Music of Johnny Cash (part of a new wave of reissues and a DVD of the birthday concert) gathers 20 of those performances. But since Cash was more of an interpreter than songwriter, some of the song choices here — like Lucinda Williams' take on Nine Inch Nail's "Hurt," Shelby Lynne and the guy from Train's cover of Bob Dylan's "It Ain't Me Babe," and Amy Lee singing Hank Williams' "I'm So Lonesome I Could Cry" — seem a little odd. But Carolina Chocolate Drop's joyous "Jackson" and Willie Nelson's faithful "I Still Miss Someone" do the Man in Black right.