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May 1, 2025
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Guido's Notation Scheme Developed (jan 1, 1001 – jan 1, 1050)

Description:

Guido of Arezzo (ca. 991-after 1033) pioneered this new notation strategy. He used a red line of ink for F and a yellow line for C, scratching the other lines in the parchment. This is the precursor to our modern system.

Added to timeline:

Date:

jan 1, 1001
jan 1, 1050
~ 49 years