Bauer Griffin, Dave Hogan/Getty Images Europe, Mark Metcalfe/Getty Images AsiaPac
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It seems like U.S. radio has been dominated by foreigners, with Brits (Adele and One Direction) and Canadians (Carly Rae Jepsen, Justin Bieber), and stealing the spotlight. But there is actually a surprising number of artists who've achieved superstardom on other shores but haven't been able to break big in the U.S.