Acts collaborated for Tibet House benefit last night (February 3)
New version of 'Cape Cod Kwassa Kwassa' posted online
The National also among acts to perform at Carnegie Hall
Patti Smith also on schedule for New York event
Station is broadcasting rare live recording on Sunday (Nov 23)
Vampire Weekend, The Young Knives and The Shortwave Set make up part of the action
They'll perform together in New York this Wednesday
Band say fans should vote – but not necessarily for whoever they're supporting
The band will be on air from 1pm (BST)
Plus they were forced to cancel Obama show on Saturday