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Cover page for the sheet music of 'Blue Danube Waltz' (1866) by Johan Strauss, 1935. (Photo by Buyenlarge/Getty Images)

Cover page for the sheet music of 'Blue Danube Waltz' (1866) by Johan Strauss, 1935. (Photo by Buyenlarge/Getty Images)

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Johann Strauß. Austria. Photograph. About 1875. (Photo by Imagno/Getty Images) Johann Strauß. Österreich. Photographie. Um 1875.

Johann Strauß. Austria. Photograph. About 1875. (Photo by Imagno/Getty Images) Johann Strauß. Österreich. Photographie. Um 1875.