Wanna bust a gut over experimental improv comedy or blow your mind with edgy indie rock, smokin' hot jazz or sweet-home-Chicago blues? No problem. Undaunted by the weather or the work week, Chicagoans turn out en masse for everything on stage from high-minded opera and orchestral concerts to brave new shows by emerging playwrights and ground-breaking modern dance companies. Refreshingly, the performing arts here are rarely a buttoned-up, blue-haired affair. Audiences of all ages embody the city's open-minded, unpretentious spirit, which rewards daring artistic underdogs even as it keeps the historic landmarks in the Theater District sold out every night of the season.