INDIGO GIRLS Beauty Queen Sister [Vanguard] The Indigo Girls’ music has always been marked by two distinct songwriting sensibilities: Amy Ray’s post-punk brashness and Emily Saliers’ more folk-inspired, laid-back vibe. That split-brain approach remains intact on the duo’s 14th studio album, but the tug of Saliers’ quieter style dominates. Soft-lit ballads and outdoorsy acoustic pop abound, nestled in rootsy instrumentation and a production...