That post has reminded me of a story about Rostropovich.
He was good friends with a very successful Sumo wrestler, Chiyonofuji Mitsugu. When Rostropovich heard that the wrestler's infant daughter had suddely died (of SIDS), unannounced he took a plane from Europe to Tokyo, took an hour long taxi ride from the airport and played the piece of music in this video outside Mitsugu's house. He then went home. It was the same piece which he played as an encore when he found himself at the Proms the night after the soviets had rolled tanks into Prague to put down the Prague spring.
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