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In page Maria Grinberg:
"When she was in her late 40s, she noticed that her vision had become significantly worse. She addressed the problem, and it turned out that she had a brain tumor which required surgery. Within a few months, she celebrated her 50th birthday by performing three piano concertos in one evening – Bach's f minor, Beethoven Third, and Rachmaninoff's Third with Moscow Philharmonic Orchestra.[citation needed]
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