Psy turns into a "Gentleman" (4)

"Gangnam Style" racked up digital sales of 3.59 million in the US and Canada last year, ninth on the best-selling list. It was third on Amazon’s MP3 song bestseller list for 2012.

But it’s been challenged by "Harlem Shake". The electronic dance track by DJ Baauer went viral as a YouTube craze after Australian teenagers posted their version of the dance, sparking thousands of imitations.

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