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A cappella group Pentatonix are famous for re-creating some of the biggest hits on the radio. The season 3 NBC Sing-Off champs have already covered chart-toppers like Psy's "Gangnam Style" and most recently released a whole Christmas EP. Now, the group brings us a special mash-up of two of Swedish House Mafia's biggest anthems "Save The World" and "Don't You Worry Child."

Their voices are euphoric together, creating a fresh take on two dance floor bombs from the famous Swedish trio. The song, as always, is performed without any instruments, in true a cappella fashion.

Check it out: