HumanitiesWeb.org - Glossary definition: Organum
Organum

A polyphonic composition based on plainchant. In organum, a new line (the vox organalis) is added to the original plainchant line (the vox principalis) and uses the same text as the original. In settings of organum, sections of a chant that were originally sung by the choir remain as plainchant, so an alternation of polyphony and monophony results.

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