The Tractatus de tonis of Guy of Saint-Denis (written ca.



1300-10) differs from other treatises on plainchant in the depth of its



analysis of the various tones into which chant was traditionally classified.



Guy's treatise presents itself as a synthetic overview of both the theory and



practice of plainchant in a way that combines the practical reflection of Guido



of Arezzo with ideas of more Aristoteleian inspired theorists such as Johannes



de Grocheio and Peter of Auvergne.



Constant J. Mews is Director of the Centre for Religious Studies, Monash University in Victoria, Australia. Carol J. Williams, John N. Crossley, and Catherine Jeffreys, all of Monash University, are specialists in medieval and Renaissance music, mathematics and logic, and the music of Hildegard of Bingen respectively.



Acknowledgments



Abbreviations



Introduction



Outline of the Tractatus de tonis



Tractatus de tonis: Text and Translation



Appendices



I. Deleted material



II. Explanatory material



Works Cited



Manuscript sources



Primary sources



Secondary sources



Lexicon



Glossary



Onomastic Index