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AIzaSyCYaC8UkdPkQKLFUmpasLV5eC3M802CrcA
91552
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dec 15, 1040 - 1040 CE Guido d’Arezzo started using five line notation

Added to timeline:

1 Oct 2017
0
0
264
nolan
Timeline #1

Date:

dec 15, 1040
Now
~ 978 years ago
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