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The Library of Congress has worked to preserve the culture of American folk music for nearly a century, first housing its archives within its music division before transferring it to the American Folklife Center in 1976. In celebration of the centennial of folklorist Alan Lomax’s birth, a group of the nation’s finest folk musicians have come together to hit the road under the banner “Treasures of the Archives Roadshow.” Headlining the tour are the Down Hill Strugglers, an old-time string band based in the wilds of Brooklyn. On this adventure, they perform with John Cohen from the New Lost City Ramblers; Jerron “Blindboy” Paxton; and Nathan Salsburg, who curates the Library’s Alan Lomax collection. When the group plays the Kennedy Center’s Millennium Stage, you’ll hear each musician take on classic folk songs like “Man of Constant Sorrow” and “Buffalo Skinners” and explain each song’s origins, thereby passing this history on to the next generation of listeners. Down Hill Strugglers perform with John Cohen and Jerron “Blindboy” Paxton at 6 p.m. at the Kennedy Center Millennium Stage, 2700 F St. NW. Free. (202) 467-4600. kennedy-center.org.