JOHN MAYER Born and Raised [Columbia] On his fifth album, John Mayer continues his slow shift away from the pop-rock mainstream and back into the singer-songwriter territory of his early days. The mostly mellow tone evinces some country leanings, with his gentle fingerpicked guitar, pedal steel and even some ’60s folk harmonica. But there are a couple of low-key classic-rock jams with quiet, rambling electric guitar leads and subtle Hammond organ...