the Papadic method, Chrysanthos described first the basic elements, the phthongoi, their intervals according to the genus, and how to memorise them by a certain solfeggio called "parallage." The thesis of the melos was part of the singers' performance and it included also the use of rhythm.

Chrysanthos' parallagai of the three genera (????)

In the early Hagiopolitan Octoechos (6th-13th century) the diatonic echoi were destroyed by two phthorai nenano and

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