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Music notation: musical notes and their corresponding rests.
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Solar eclipse of the sun.
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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
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Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution
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Bar graph of the United States Death Toll during major events. Infogram chart.
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Adolf Hitler (Nazi, nazism, German leader).
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mensural notation development

  • musical notation; sheet music
    In musical notation: Mensural notation

    ā€¦mensural notation evolved, another device, coloration, came into use. If a composer wished to render a potentially perfect note imperfect, he could write it in red or as a hollow note (as , š¯…†, š¯†¹); these two devices had, however, various other, less common meanings. About 1400, hollow note shapesā€¦

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