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On what’s billed as his “first U.S. band tour in 20 years,” Breton harpist Alan Stivell is promoting a suitably epochal album. Recorded in Brittany, Ireland, Scotland, and Wales—largely in the traditional languages of those nations—Brian Boru is nothing less than an overview of Celtic music and culture today. From traditional tunes to Breton-language hiphop, Stivell and a score of Celtic musicians celebrate ancient heroes and lament the burning of the Breton parliament. At 2 p.m. at Borders, 5871 Crossroads Center Way, Bailey’s Crossroads. FREE. (703) 998-0650; at 8 p.m. at the Birchmere, 3701 Mount Vernon Ave., Alexandria. $15. (703) 549-7500. (Mark Jenkins)