The traditional Jewish dance music from eastern Europe, which has undergone a tremendous revival in the past decade, received even more of a boost when master violinist Itzhak Perlman teamed up with four leading klezmer bands for In the Fiddler’s House, a PBS special and companion Angel recording. If you missed out on both those projects (and didn’t catch the marvelous June 10 concert at Wolf Trap featuring Perlman and his klezmer friends) here’s a chance to make up. Brave Old World, which was featured in all three Fiddler’s House manifestations, will be appearing tonight. Falling in the middle of the spectrum running from progressive/avant-garde (the Klezmatics) to traditional (Kapelye), Brave Old World is an entirely acoustic band that performs a mixture of contemporary and older material. There will be hot, jazzy improvisations on fiddle, accordion, and clarinet, along with fine singing by Michael Alpert. At 8 p.m. at the Birchmere, 3901 Mount Vernon Ave., Alexandria. $17.50. (703) 549-5919. (Ken Roseman)