descant

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An analysis of the three-part antiphons of the Glogau manuscript describes the transformation of the chant into a strict succession of breves in the discantus, broken by the syntactical subdivisions of the text and adapted to the breath of the singer by caesuras.
The following circumstances argue against this reading: (1) in contrast to the double meaning of discantus, which is both one of the three species of polyphony and a voice discanting in recto modo, i.
In addition to the word organum, the word discantus was in general use for improvisation using a second (upper) voice over a plainchant melody.