This 2-CD set of Gregorian Chant by the Monks of Solesmes contains "Christmas" and "Christmas: The Night Office." Since 1833, the research and study of Gregorian Chant by the Monks of the Abbey of St. Peter in Solesmes, France, has focused on making this sung form of prayer the finest possible offering for God, to whom it is addressed six times a day at the Abbey. In Christmas: The Night Office Vigils - the beautiful Gregorian chants of Vigils- the monks celebrate the birth of Jesus at the same time of night he was born in Bethlehem. In Christmas-Midnight Mass and Mass of the Day - included are Introits, Graduals, Alleluias, Offertories, Communions, Responses, Sequences, Hymns, and Tropes from the Midnight Mass and the Mass of the Day.