BETHEL, NY - AUGUST 15: Members of Jefferson Starship Paul Kantner (L) and Slick Aguilar perform at the concert marking the 40th anniversary of the Woodstock music festival August 15, 2009 in Bethel, New York. On August 15-17 in 1969 an estimated 400,000 music fans gathered on Max Yasgur's farm in Bethel, New York for one of the most celebrated music festivals ever. The 40th anniversary concert will take place tonight. (Photo by Mario Tama/Getty Images) *** Local Caption *** Slick Aguilar;Paul Kantner