On All That We Let In, Atlanta’s Indigo Girls adopt a slightly warmer sound than on their previous nine albums. Between Amy Ray’s raw rock leanings and Emily Saliers’ supple folk-pop, they had perfected the balance of political and personal. With its bright organ and sweet harmonies, “Fill It Up Again” is a winsome and hopeful breakup ballad, while the snarling guitars and speculative lyrics of the stomping rocker “Tether” showcase social consciousness.