Advent O antiphons Posted on December 23, 2021December 28, 2021 by Br. Denys The special “0” antiphons are sung at Vespers beginning Dec. 17. They are always sung a week before Christmas to remind us of the coming of the Messiah. These beautiful sketches are a gift of the Ursulines of Bruno. Br. Denys Janiga Posted in News.