Even when John Mayer is rocking out, the precision of his guitar skills and the sensitivity of his songwriting are impossible to miss. So he's still playing to his strengths when he uses a gentler touch, whether that means adding a bit of sweet soul to an acoustic take on Tom Petty's “Free Fallin'” or getting front-porch folkie on the laidback, autumnal title track of 2012's Born and Raised.