Late Sunday afternoon, the left-leaning political organization Music for Democracy hosted a Be the Change Launch Event at New Yorks St. Raphael’s Cathedral. In addition to short, acoustic performances by Crosby & Nash, Vampire Weekend and Israeli singer/songwriter Dan Reed, the concert boasted appearances by noted pundits David Bender (Air America Radio) and Jim Dean (Democracy for America), as well as a silent auction and VIP reception. At the end of the night, Crosby & Nash invited both Reed and the members of Vampire Weekend onstage for a spirited rendition of their hippie-anthem Teach Your Children.

The surprise sit-in is the latest victory for indie-sensations Vampire Weekend, a group that has scored an appearance on Saturday Night Live, the cover of Spin magazine and a nod of approval by David Byrne in the past twelve months. For Sundays performance, Vampire Weekends Chris Tomson also helped recreate the feel of Graham Nashs classic arrangement by switching from drums to mandolin. The group will kick off a European tour at Birmingham, UKs Carling Academy on October 20, while Crosby & Nash will appear at Westbury, NYs Capital One Bank Theater this evening.