Discussion of didactic material about modality for Milan and Paris

La discussion des exposés didactiques était née dans la discussion de la main guidonienne avec les symboles dasianes.

Nicolas Meeùs m'a demandé de discuter son exposé didactique « la modalité formulaire du chant grégorien » qu'on pourraît télécharger

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Guido and the diesis

I'd like to open myself the discussion that Oliver Gerlach promised in the Low B-flat discussion. It refers to Guido of Arezzo's mention of the usage of the diesis in proper and inappropriate positions in the scale.

A first question that I have concer

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Aurelian of Réôme's reception of the lesser perfect system: the 15 modes organized in triphonia

Scholars of Western chant usually rely on Guido of Arezzo, when they reduce the discussion of microtones to the question where to use b flat, they do even so, if the source is older than Guido's Micrologus. But what are the sources for earlier refere

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The Use of Microtones in Plainchant since Pythagoras in Italy, Boethius in Rome and Justinian in Constantinople

Neil Moran wrote:

"Byzantine liturgical music is based on the principles of Pythagoras, classical Greek music theorists and Boethius, the contemporary of Justinian, who established a corps of 25 singers (including eunuchs) in the Hagia Sophia (consecr

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