Léonin
1130 - December 26, 1201born in Paris, France, composed during the Medieval period
Biography
Léonin, or Magister Léoninus, is identified through a thirteenth century English source, Anonymous 4, as the composer and compiler of the Magnus Liber organi de gradali et antiphonario pro servitio divino. This massive work originally consisted of musical settings for the entire church year, feast days and Saints days, with two-voice polyphonic responses for each scripture reading. The Magnus liber was compiled about 1170, and was utilized first by the choir of the Cathedral of Notre Dame, still under construction at the time the book appeared. This music is known in four major manuscripts; Wölfenbuttel 677 (W1) and 1099 (W2), Codex Florenz, and Codex Madrid, the last named containing a condensed version of the Magnus liber. W1, though chronologically the "youngest" of these late thirteeth century manuscripts, is believed to contain the music which is closest to Léonin's original concept.
Anonymous 4 refers to Léonin as "optimus organista," and in his work he employed a two-part polyphonic texture which Léonin termed Organum Duplum; the tenor was the "principal voice" (vox principalis), generally intoning long syllables drawn from plainchant, and an "organizing voice" (vox organalis) which added freely rhythmic melismata up above.
Selected Discography

