Paul Barrere and Fred Tackett make their debut as an acoustic duo at the Barns at Wolf Trap, offering stripped-down versions of Little Feat treasures ("Two Trains," "Dixie Chicken," and if everyone's lucky, "Spanish Moon"), plus newer originals, all supported by a healthy dose of slide guitar, mandolin and instrumental improv. Wednesday, Nov. 3, at 8 p.m. The Barns at Wolf Trap, 1645 Trap Road, Vienna. Tickets are $25. Call 703-255-1900 or visit wolf-trap.org.