From The Epoch Times, here:
At the White House State dinner on Jan. 19, about six minutes into his set, Lang Lang began tapping out a famous anti-American propaganda melody from the Korean War: the theme song to the movie “Battle on Shangganling Mountain.” ... “In the eyes of all Chinese, this will not be seen as anything other than a big insult to the US,” says Yang Jingduan, a Chinese psychiatrist now living in Philadelphia who had in China been a doctor in the Chinese military. “It’s like insulting you in your face and you don’t know it, it’s humiliating.”
Here's a screenshot of the Wikipedia entry, before someone changes it:
Let's send Lang Lang back back to China where he belongs. The president can go with him.