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This treatise discusses modified parallel [[organum]] as well as free organum. The examples given are in two voices, set note-against-note, and the voices are frequently permitted to [[voice crossing|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 (music)|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]].<ref>Hoppin, Richard H. ''Medieval Music''. Norton, 1978, pp. 194-195.</ref>
==References==
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