The musical notation system was different in the late Middle Ages than it is today. The Mensural notation for example is the musical notation system used for European vocal polyphonic music from the later part of the 13th century until about 1600. In the table you can clearly see how more and more notes were added in the 14th and 15th century.
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![[Image: kyrie.png]](https://wwwhomes.uni-bielefeld.de/mwille2/VMS/kyrie.png)
Comparison of the spelling of two compositions by Guillaume Dufay. On the left a Kyrie in black notation (ca. 1430-1440), on the right a Kyrie in white notation (ca. 1472)
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Comparison of the spelling of two compositions by Guillaume Dufay. On the left a Kyrie in black notation (ca. 1430-1440), on the right a Kyrie in white notation (ca. 1472)