In Allied countries, Stalin was increasingly depicted in a positive light over the course of the war. In 1941, the London Philharmonic Orchestra performed a concert to celebrate his birthday, and in 1942, "Time" magazine named him "Man of the Year". When Stalin learned that people in Western countries affectionately called him "Uncle Joe" he was initially offended, regarding it as undignified. There remained mutual suspicions between Stalin, British Prime Minister Winston Churchill, and U.S. President Franklin D. Roosevelt, who were together known as the "Big Three". Churchill flew to Moscow to visit Stalin in August 1942 and again in October 1944. Stalin scarcely left Moscow throughout the war, with Roosevelt and Churchill frustrated with his reluctance to travel to meet them.