Irish singer Maura O'Connell got her start as vocalist for the traditional Celtic group De Dannan, but now as a solo artist, she offers contemporary, American country-influenced interpretations of Irish folk songs. Her most recent album, 2009's Grammy-nominated Naked With Friends, was her first all a cappella set, with guest vocalists including Moya Brennan, Jerry Douglas, Alison Krauss, Tim O'Brien, Dolly Parton and Darrell Scott. Saturday, Feb. 26, at 7:30 p.m. The Birchmere, 3701 Mount Vernon Ave., Alexandria. Tickets are $29.50. Call 703-549-7500 or visit birchmere.com.