Kay Kay and His Weathered Underground is an indie-rock orchestra with big-top pizzazz, a freewheeling vaudevillian jamboree, with bandleader Kirk Huffman as our cool-kid ringmaster. The 11-piece ensemble's muted trumpets and pizzicato strings maximize the good-time swing and big-band drama. Opening pop band Aqueduct has the most fun onstage, and their rosy-cheeked enthusiasm is contagious. (Chop Suey, 1325 E Madison St, 324-8000. 8 pm, $10, 21+.)