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Three bifolia of a manuscript probably produced in Fleury, containing musical treatises by Guido of Arezzo and illustrated with various diagrams. This fragment came to Bern in 1632 as part of the bequest of Jacques Bongars.
(Dr. Florian Mittenhuber, Burgerbibliothek Bern)Download this page
Bern, Burgerbibliothek, Cod. A 91.21, 1v – Guido Aretinus, Micrologus; Regulae rhythmicae — https://fragmentarium.ms/view/page/F-57h6/5279/50065/0