Guido d'Arezzo
Guido d'Arezzo: Ut queant laxis
The use of the “ut–re–mi–fa–so–la” mnemonic, called also solmization, is due to the famous Italian music theorist Guido d'Arezzo (991-after 1033). Each note's name is the initial syllable of each subdivision of the first stanza of the “hymn to John the Baptist”, whose text is attributed to the Italian monk Paulus Diaconus (8th cent.):
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