descant

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The effect is musical; "Quarry" is a discant played against a melody; in other words - plain-song.
In passages of discant, where the tenor rhythm is measured and offers a control for the interpretation of the rhythm of the duplum, the transcription employs modern time values.
These constructs relate to the once living musical practice to the extent that they mirror simple discant clausulas, early motets, and even brief segments of some larger organa.
better at writing discant than his predecessor, whose organa contained long sections of organal polyphony not subject, according to the thirteenth-century commentator Johannes de Garlandia in his De mensurabili musica, to the rules of discant.
One of the lutes plays the discant, the other the tenor (and perhaps the contratenor as well).