They join previously announced acts Bruce Springsteen, Sir Paul McCartney, Bon Jovi, Kanye West, Alicia Keys, Eddie Vedder and Dave Grohl on the December 12 show in New York City.
Proceeds from the event will benefit the Robin Hood Foundation, which is aiding in recovery efforts throughout the States damaged by the Superstorm in October.
Organisers have also announced that The Concert for Sandy Relief will be available to 1 billion people on television and on the internet.
AMC, CBS, HBO, Showtime, VH1 Classic, Encore, EPIX, IFC and the Sundance Channel are among the networks that will broadcast the show in the US.
AOL, Hulu, YouTube, Vevo, Yahoo and iHeartRadio will also be streaming The Concert for Sandy Relief.
The Robin Hood Foundation previously organised the fundraiser Concert For New York City following the 9/11 terror attacks in 2001.
Watch Coldplay's 'Fix You' music video below: