The Cambridge History of Western Music Theory
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49–56, and the “Introduction” by Dolores Pesce in Guido d'Arezzo's Regule
Rithmice, pp. 1–38, also represent significant contributions to the studyof this
crucial theorist. 75 Guido, Micrologus 5, ll. 19–20 (Waesberghe edn., pp. 112–13)
.