Music Term: Note-against-note organum
Definition and background:
A polyphonic composition (eleventh to early twelfth centuries) based on plainchant in which the new voice is added above the original voice; the voices move in a mixture of contrary, oblique, similar and parallel motion, though most of the resultant intervals are fourths, fifths, unisons and octaves. See organum.
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Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary