Justin Vernon, a.k.a. Bon Iver, has come out with a second, eponymous album that’s as intimate and gratifying as his folky debut, For Emma, Forever Ago. But Vernon has stepped up his game even more, imbuing his mystical falsetto harmonies with an edge of experimental pop. Some of the songs have a touch of Beach Boys flavor, but despite his upper register, Vernon’s voice is too wounded and ethereal to be dubbed boyish. Hovering about a haze of acoustic guitars and airy synths, his dreamy melodies make for perfect summer escapes.