It’s been more than two decades now since Chapman scored major success with “Fast Car” and her self-titled debut album. Late last year she released Our Bright Future, which is every bit as steeped in quiet, emotionally resonating folk as the Grammy-winning pop singer’s previous output. Her music hasn’t aged at all, and her lyrics are still heavy with socially conscious sentiments but light on personal specifics. Chapman is still as enigmatic as ever. Tonight, Saturday, Aug. 8. Doors at 8 p.m. Nightclub 9:30, 815 V St. NW. Tickets are $40. Call 202-265-0930 or visit www.930.com.