I was a fan of singer Michael Mcdonald (Look up "On My Own"). Once Mcdonald was invited by president Bush to the white house to perform. US invated Iraq at that time. So Mcdonald decided to sing "Sweet Freedom" on the spot. His band hesitated, he told them to just follow his lead, so they performed that song. Anything happened to him afterward? NO, no big deal.
To the Chinese who made a big fuss about Lang Lang, I mean the ones who critized his choosing My Homeland to perform, please get a live, a dignifed one, or you will not be respected by either Chinese or Americans.