Psy joins Madonna onstage at Madison Square Garden

'At her Madison Square Garden concert in New York City on November 13th, Madonna surprised fans with back-to-back duets with Korean artist PSY (aka Park Jae Sung) of "Gangnam Style" fame. They two did Madonna's songs "Give It 2 Me" and "Music", with Madonna vamping and camping alongside the artist whose international hit has been viewed half a billion times on YouTube.' height

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