Indigo Girls, Joan Baez

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Both clarion-voiced firebrand Joan Baez and new-age folkies the Indigo Girls have built enduring musical careers nestling socially conscious lyricism in the cocoon of a lovely tune. Find yourself transported to the 1960s when Baez and the Indigo Girls, Amy Ray and Emily Saliers, harmonize under the stars in this double-bill at Wolf Trap. At the Filene Center.