Swedish House Mafia formed in Stockholm Sweden and has gained great popularity among electronic dance charts. "Don't You Worry Child" can be found on their 2012 album release Until Now.
They've been called "the best-known elementary-school chorus on the planet," and they've performed with everyone from Katy Perry to Common, but the adorably harmonizing kids of New York's PS22 Chorus are probably always going to be best known for their YouTube covers of other artists' hits -- and they've done it again with their version of Swedish House Mafia's latest (and presumably final) single, 'Don't You Worry Child.'