In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: Machaut wrote a mass known as " Messe de Nostre Dame " .
A: 
Machaut wrote the " Messe de Nostre Dame " , the earliest known complete setting of the Ordinary of the Mass attributable to a single composer .