Chinese pianist Lang Lang (L) speaks while Grammy Museum Executive Director Bob Santelli looks on during an interview with media at the Grammy Museum in Los Angeles, the United States, Jan 22, 2014. Lang Lang will perform with rock supergroup Metallica during the upcoming Grammy awarding ceremony on Jan 26. [Photo/Xinhua]

Chinese pianist Lang Lang performs at the Grammy Museum in Los Angeles, the United States, Jan 22, 2014. Lang Lang will perform with rock supergroup Metallica during the upcoming Grammy awarding ceremony on Jan 26. [Photo/Xinhua]

Chinese pianist Lang Lang reacts during an interview with media at the Grammy Museum in Los Angeles, the United States, Jan 22, 2014. Lang Lang will perform with rock supergroup Metallica during the upcoming Grammy awarding ceremony on Jan 26. [Photo/Xinhua]