In the past, famed "Gangnam Style" Korean rapper Psy wasn't always making music about dancing and "sexy ladies."  Instead he focused on much more serious, politically driven topics and actually recorded a song called "Dear American" with Korean rock band N.E.X.T. in which he rhymed about killing American soldiers. The song was made back in 2004 during a protest against U.S. forces in Iraq when he and many others were angry about the beheading of a Korean missionary and they let their voice be heard through music.  

Psy spit:

"Kill those f-cking Yankees who have been torturing Iraqi captives
Kill those f-cking Yankees who ordered them to torture
Kill their daughters, mothers, daughters-in-law and fathers
Kill them all slowly and painfully"

He was clearly upset at that moment, but given his current international stardom in which his "Gangnam Style" has the most views on YouTube, it would appear as though he's put those past angry feelings about America behind him.  He is scheduled to visit President Obama at the National Building Museum's Christmas event this weekend.