The Celtic rock band Gaelic Storm formed at an Irish pub in Santa Monica, Calif., in 1996, and a year later they appeared in James Cameron's Titanic as the steerage band -- yes, the famous sinking ship movie turned out to be a perfect springboard for their still-sailing career. Sunday, Sept. 12, at 7:30 p.m. The Birchmere, 3701 Mt. Vernon Ave., Alexandria. Tickets are $35. Call 703-549-7500 or visit birchmere.com.