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This recording includes the proper chants of the three Masses of Christmas (Midnight, the Mass at dawn, and the Mass of the day) as sung at St. Michael's Abbey. They are still in use after all these centuries and retain their sacramental quality, their supple vigor, and the ability to dispose the soul for the contemplation of God and His Mysteries.

The repertoires of chant are almost like "dialects" of the Gregorian repertoire - there is a substantial overlap of texts and settings found in the Roman Missal (for the Mass) and Antiphonarium (for the Liturgy of the Hours), but there are items that differ in part of completely.

1) Missa In Nocte Introit
2) Missa In Die Offertory