VIDEO: Paul McCartney Joins Nirvana at 12-12-12 Benefit Concert

At last night's 12-12-12 concert for Sandy Relief at The Madison Square Garden, Paul McCartney performed a "new song" with members of Nirvana. The performance marked a reunion for the late Kurt Cobain's band featuring surviving members Dave Grohl and Krist Novoselic. The duo has not performed together in 20 years. Check out the performance below!

The "12-12-12" concert was distributed worldwide to nearly two billion people through television feeds, radio and online streaming, and is presented by Chase and all proceeds will benefit the Robin Hood Relief Fund. The concert was available to 114 million television households on 37 channels in the US and to more than 400 million television households outside the country via networks and feeds in North and South America, Europe, Africa, Asia and Australia.

The concert is being produced by James Dolan, Executive Chairman of The Madison Square Garden Company; John Sykes, President of Clear Channel Entertainment Enterprises; and Harvey Weinstein, Co-Founder and Chairman of The Weinstein Company.

Thanks to the generosity of concert organizers, sponsors, and Robin Hood's board of directors, every single penny from ticket purchases and donations will go to organizations serving the victims of Hurricane Sandy through the Robin Hood Relief Fund. The Robin Hood Relief Fund provides money, material and know-how to local organizations that are serving families and individuals in the regions hardest hit by the storm.