Hiroyuki Ito for The New York Times

The Polish pianist Krystian Zimerman surprised his audience during a recital Sunday at the Walt Disney Concert Hall in Los Angeles when he announced that he would no longer perform in the United States in protest of the country’s military policies, the Web site of The Los Angeles Times reported. Mr. Zimerman was about to play Karol Szymanowski’s “Variations on a Polish Folk Theme,” his final piece of the evening, when he told concertgoers that he would not continue to perform in a country whose military, he said, wants to take over the world. “Get your hands off my country,” Mr. Zimerman said, according to the report. In 2006, Mr. Zimerman halted a performance at Carnegie Hall when he believed he observed a concertgoer recording the recital. A Steinway grand piano that he traveled with was destroyed by the Transportation Security Administration amid heightened security after the 9/11 attacks, apparently because the piano’s glue resembled a compound used in explosives.