Guillaume de Machaut’s Messe de Nostre Dame (Mass of Our Lady) is the first complete, polyphonic setting of the Mass Ordinary known to be written by a single composer. Composed in the early 1360s at Reims Cathedral, it transformed the way sacred music was structured, moving away from anonymous, disjointed fragments toward a unified artistic whole. A Masterpiece of the Ars Nova
The Mass was likely written for the Saturday "Lady Mass" at Reims Cathedral , where Machaut served as a high-ranking cleric. Machaut Messe de Nostre Dame
: It expanded sacred music to four independent voices, adding a "contratenor" for deeper harmonic richness. Guillaume de Machaut’s Messe de Nostre Dame (Mass