Léonin
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Léonin was the first known significant composer of polyphonic organum. He was probably French, probably lived and worked in Paris at the Notre-Dame Cathedral and was the earliest member of the Notre D
Organum over the solo verse «Voce quippe de celo» of the responsorium prolixum for Saint Nicholas (6 December) in the appendix of the Vatican organum treatise (V-CVbav Ottob. lat. 3025, f.49v)
Pérotin
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Pérotin was a composer associated with the Notre Dame school of polyphony in Paris and the broader ars antiqua musical style of high medieval music. He is credited with developing the polyphonic pract
Léonin
…better than Leoninus, but this cannot be said about the subtlety of his organum. Much of the Magnus Liber (as it is present from later manuscripts after Pérotin) is devoted to clausulae—melismatic portions of Gregorian chant which were extracted into separate pieces where the original note values of the chant…
Notre-Dame and the rest of Paris in the background of a c. 1452–1460 illuminated manuscript by Jean Fouquet
Pérotin's monophonic Beata viscera from Wolfenbüttel 1099 (W2) MS
Perotin Alleluia nativitas