Billboard reports that Crosby & Nash performed unamplified in Manhattan's Zuccotti Park in support of the nearly two-month-old Occupy Wall Street movement.
They played a set that also included "Long Time Gone," "What Are Their Names," "Military Madness" and "They Want It All."
"I think what David and I are hearing are the voice of the people," Nash told Rolling Stone.
"Everybody is realizing that they're getting screwed," Crosby added. "People are recognizing the basic truth that the system is loaded against them, and they're looking for equality. It's a simple thing."