Dylan did Dylan things. He offered fair warning at the outset, as he sang, “It ain’t me you’re lookin’ for, babe.” The singer has never spelled out who he is, but he’s been blunt in declaring who he’s not. The man who once sang, “Money doesn’t talk, it swears,” also believes that nostalgia doesn’t sustain careers, it kills them. And so he placed heavy emphasis on his most recent albums, including a series of recordings devoted to the great American songbook. A little bit of that material goes a long way, as Dylan’s unruly voice remains better suited for snarling lines such as “I pay in blood, but not my own” from one of his originals rather than shakily crooning Cy Coleman’s “Why Try to Change Me Now.”