Details:
In Masses celebrated in accordance with the 1962 Roman Missal the Gloria is sung frequently: the 1960 Code of Rubrics require it at not only on I and II-class feasts (corresponding to solemnities and feasts in the post-Vatican II Mass) but also on III-class feasts (corresponding to memorials in the later form).
In the 1962 form it is also said on ferias of Christmastide and Paschaltide even outside the octaves, but is omitted during the Septuagesima season, which does not exist in the post-Vatican II liturgy. The Gloria is also sung in both the pre-Vatican II and in the later form of the Roman Rite at the Mass of the Lord's Supper in the evening of Maundy Thursday and at the Easter Vigil.
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