Requests to Pogorelich's representatives at Columbia Artists Management Inc. for comment or further information had not been answered by press time.

Replacing Pogorelich at La Roque on July 28 will be Andrei Korobeinikov. The 20-year-old Russian pianist has won 17 prizes in international competitions; most recently, he was gold medalist at the 2004 International Scriabin Piano Competition in Moscow and won both second prize and the audience prize at the 2005 International Rachmaninoff Piano Competition in Los Angeles.