Infusing the intimacy of coffeehouse folk with the earnest swagger and earthy conscience of Springsteen-style heartland rock, The Indigo Girls carve out a space of belonging in their harmonies. From their self-titled 1989 debut, the Georgia duo of Amy Ray and Emily Saliers have explored hard issues—existentialism, abuse—in heartfelt, poetic songs like “Closer to Fine”. With time, their tunes have taken on richer textures and their politics have become more explicit, but even songs like “Shame on You” (an excoriation of anti-immigrant sentiment) retain a campfire sing-along buoyancy.