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- Dictionaryor·ga·num/ˈôrɡənəm/
noun
- 1. (in medieval music) a form of early polyphony based on an existing plainsong.
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noun
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Medieval polyphony most often based on a cantus firmus
Organum is, in general, a plainchant melody with at least one added voice to enhance the harmony, developed in the Middle Ages. Depending on the mode and form of the chant, a supporting bass line (or bourdon) may be sung on the same text, the melody may be followed in parallel motion (parallel organum), or a combination of both of these techniques may be employed. As no real independent second voi... Wikipedia