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Birgit Nilsson was a Swedish operatic soprano who had a successful career from the 1950s to the 1980s. She was known for her powerful and dramatic voice, and she was particularly associated with the roles of Brünnhilde in Wagner's Der Ring des Nibelungen and Isolde in Wagner's Tristan und Isolde. Nilsson retired from the stage in 1984, but she continued to perform in concerts until her death in 2005.