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The Indigo Girls ring truest when they lighten up a bit. Their sixth album, Shaming of the Sun, takes little trips back to such high-spirited tunes from their most hopeful CD, Rites of Passage, as “Shame on You” and “It’s All Right,” then ventures into mournful heartwrenching with “Leeds” and “Everything in Its Own Time.” While 1994’s Swamp Ophelia gave the impression that Amy Ray and Emily Saliers’ songwriting interests were divergent enough to predict a split, Shaming integrates their styles enough to dissipate those rumors. Ray remains on her Indian-roots trip, Saliers still rewards reference-hungry literature students, and as they alternate songwriting credits, their arrangements have acquired a more confident, though not uniformly comprehensible, symphony. Native American vocal trio Ulali, who also sing backup on Shaming, will open at 8 p.m. Wednesday and Thursday at Wolf Trap Filene Center, 1624 Trap Rd., Vienna. $16-26. (703) 255-6500. (Ginger Eckert)