Musicians David Crosby and Graham Nash, icons of the 1960s folk-rock era, serenaded anti-corporate protesters at the Occupy Wall Street camp in New York. Hundreds of the protesters, many of whom were not even born when the pair, along with Stephen Stills and Neil Young, formed their legendary counter-culture super-group, crammed into Zuccotti Square in New York's financial district to hear the duo's acoustic five-song set. "You know some of the songs, so sing with us," Nash, 69, called out to the enthusiastic gathering before launching into "Long Time Gone." The crowd sang along, too, to other folk-rock classics including "Teach Your Children" as the white haired-singers brought the spirit of the protesting 1960s to the audience who have been camping here since September 17 in the heart of global finance. "Keep going, keep going, stay there," said an approving Nash to cheers from the crowd. The pair, symbols of the Woodstock years, were the latest in a host of celebrity backers for the Occupy Wall Street movement, who have denounced what they see as greed of Wall Street corporations and the inequalities fostered by the richest one percent in the country.