Which group is from the United States, Gnarls Barkley or The Joy Formidable?
Gnarls Barkley: Gnarls Barkley is an American soul duo, composed of singer-songwriter CeeLo Green and producer Danger Mouse. The Joy Formidable: The Joy Formidable is a Welsh alternative rock band, formed in 2007 in North Wales and currently based in London, England.
Gnarls Barkley