first known significant composer of polyphonic organum
Léonin, Pérotin, Tonus Peregrinus
Léonin, Red Byrd
Léonin, Red Byrd, John Potter, Richard Wistreich, Cappella Amsterdam
Léonin, Pérotin, Orlando Consort
Léonin, Ensemble Organum, Marcel Pérès
Léonin, Pérotin, Notre Dame Organa De Santa Maria, Russell Oberlin, Charles Bressler, Donald Perry, Seymour Barab
