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Title: Micrologus  
Author: World Heritage Encyclopedia
Language: English
Subject: Antiphonary of St. Benigne, Tedald (bishop of Arezzo), Medieval music manuscript sources, Suitbert Bäumer, Llibre Vermell de Montserrat
Publisher: World Heritage Encyclopedia


The Micrologus is a treatise on Medieval music written by Guido of Arezzo, dating to approximately 1026.[1] It was dedicated to Tedald, Bishop of Arezzo. This treatise outlines singing and teaching practice for Gregorian chant, and has considerable discussion of the composition of polyphonic music.

This treatise discusses modified parallel cross. He advised against use of the perfect fifth and minor second, favouring instead the major second and perfect fourth (though thirds were also permitted).

One point of importance is his guideline for the occursus (meaning "meeting" or "concurrence", running on the same path), which is a predecessor of the later cadence. An occursus occurs where two voices approach a unison. He suggested that the unison should be approached either by contrary motion from a major third, or oblique motion from a major second.[2]


  1. ^ (subscription required)
  2. ^ Hoppin, Richard H. Medieval Music. Norton, 1978, pp. 194-195.

External links

  • Micrologus Guidonis de disciplina artis musicae
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