So sorry American ATRLers but your country has so many global stars that it wouldn't be fair (Maybe Michael Jackson is the most global American singer he is known pretty much everywhere)
Anyway for everyone else who is the most global artist to come out of your country?
Post a picture, say where country they're from and in what regions they smashed.
For my country (Mexico) the most global music artist was this teen pop band called RBD. They smashed in Latin America (Brazil included), Spain, and Eastern Europe mostly.