Last night Lenny Kravitz took the stage of Late Show with David Letterman and delivered a poppy, joyful version of "Stand," the lead single from his new album Black and White America. Despite the confines of an in-studio performance, the veteran rock star bubbled over with energy, encouraging the studio audience to clap and sing along. "C'mon, y'all!" he shouted repeatedly, stomping his boot to the beat.