Answer :
A mass by Guillaume de Machaut.
Guillaume de Machaut, also spelled Machaut, Machaut, Machaut (b. c. 1300, Machaut, Father - d. 1377, Reims), French poet and musician, greatly admired by his contemporaries as a master of French poetry, French was considered one of the leading composers of 14th century musical style Ars Nova (see there).
Machaut contributed to the development of motets and secular song forms (particularly Rye and Form Modifications: Rondeau, Villeray, Ballade).
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