De musica

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The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

Space race (1957-1969) infographic between United States (U.S.) and Russia. America, Soviet Union, U.S.S.R., space exploration

Timeline of the Space Race, 1957–69

Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium

When Was the Periodic Table Invented?

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

Meghan, Duchess of Sussex in 2019. (Meghan Markle, British royalty)

6 Things You Should Know About Meghan, Duchess of Sussex

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

De musica

work by Saint Augustine

Learn about this topic in these articles:

study of metre in music

In rhythm: Metre
Augustine (354–430), in De musica, added more.
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