Amy Ray and Emily Saliers are singer-songwriters who have been making music together as the Indigo Girls for 30 years. Their latest album, “One Lost Day,” was released in June 2015. Emily Saliers is also the co-author of “A Song to Sing, A Life to Live: Reflections on Music as a Spiritual Practice.” Amy Ray’s latest solo album, “Goodnight Tender,” was released in January 2014. This interview is edited and produced with music and other features in the On Being episode “Amy Ray and Emily Saliers — Music and Finding God in Church and Smoky Bars.”