: The work includes the five sections of the Ordinary —Kyrie, Gloria, Credo, Sanctus, and Agnus Dei—plus the dismissal, Ite Missa Est .
: It expanded sacred music to four independent voices, adding a "contratenor" for deeper harmonic richness. Machaut Messe de Nostre Dame
: Machaut used isorhythm , a complex system of repeating rhythmic patterns, primarily in the tenor lines. The Story of its Creation : The work includes the five sections of