McCartney/Nirvana! Bruce/Bon Jovi! And Kanye's Skirt: The 12-12-12 Concert Wrap-UpBruce Springsteen and Jon Bon Jovi blew minds of New Jersey-ians. R.E.M.'s Michael Stipe came out of retirement. Eddie Vedder joined Roger Waters for a Pink Floyd classic. Kanye West wore a kilt - which soon got it's own Twitter handle (and over 1,000 followers!). Jay-Z was a no-show. And, apparently, Paul McCartney has joined a new band... with the surviving members of Nirvana. It all was part of 12.12.12 The Concert For Sandy Relief benefitting the Robin Hood Foundation.