The Triplex and Novum editions usually have marginal reference to the source chants for "neo-Gregorian" centonizations.The current Mass was composed on the occasion of her canonization in 1925. While certain parts of the Mass take up known themes in the process of centonization—such as the Offertory or the jubilus of the Alleluia—the other parts were composed of all pieces [?], on melodies not always happy, which makes this Mass difficult in its execution.
I'm not entirely sure if the question is about the chant per se, how the texts for new Masses are chosen, or both
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