Folk legend Pete Seeger and '60s folk singer Arlo Guthrie joined in with Occupy Wall Street protesters last night for a march on the Upper West Side. Approximately a thousand people took part in the march down Broadway from Symphony Space to Columbus Circle, mixing popular OWS chants ("We are the 99 percent") with protests songs (including "We Shall Overcome") all along the way. The 92-year-old Seeger was accompanied by musician-grandson Tao Rodriguez Seeger, composer David Amram and bluesman Guy Davis. Below, check out several videos of Seeger, Guthrie and all the other marchers singing in the streets: