Crosby, Stills + Nash

Crosby, Stills & Nash was the Lollapalooza headliner of its time, a festival youth-magnet ringer. But these days, the trio of counter-culture survivors serves as counter-programming, a simultaneous reminder of what once was and a blatant riposte to what currently is. Soak in their septuagenarian harmonies at the start of spring in the Chicago Theatre.