Aspen/Snowmass, Colo., January 7, 2010 – Vampire Weekend, Colombia University grads turned indie-rockers, will headline this year’s Spring Jam at the CORE Party, a free concert in downtown Aspen, at the cross streets of Galena Avenue and Cooper Street on Saturday, March 20 at 8 p.m. Vampire Weekend, comprised of Ezra Koenig, Chris Baio, Rostam