The before-show press conference, backstage, Mid-South Coliseum. DEVIN McKINNEY  •  I'm a bit ashamed to say it's taken me this long to listen to something I've had on the shelf for a few years—the audience recordings of the Beatles' afternoon and evening shows at Memphis's Mid-South Coliseum, midway through their final tour. The evening show is the famous one: Near the end of "If I Needed Someone," the third song, a cherry bomb was thrown onstage and exploded. I remember reading that three teenagers, adolescent mischief-makers with no malign intent beyond literally making a noise, were detained by security. I [...]