“Even the Darkness Has Arms” is an immediate joy, from the light fingerpicking of its opening, to Brad Barr’s gently assuring vocal delivery, the pitter-patter of brother Andrew Barr’s percussion, and the serene atmospherics of Andrés Vial’s pump organ. While Sarah Page lacks the harp she favors on The Barr Brothers’ stunning self-titled 2011 debut, her guitar picking here is just as celestially ebullient.