All who pray the divine office, whether in choir or in common, should fulfill the task entrusted to them as perfectly as possible: this refers not only to the internal devotion of their minds but also to their external manner of celebration.
It is, moreover, fitting that the office, both in choir and in common, be sung when possible.
100. Pastors of souls should see to it that the chief hours, especially Vespers, are celebrated in common in church on Sundays and the more solemn feasts. And the laity, too, are encouraged to recite the divine office, either with the priests, or among themselves, or even individually.
101. 1. In accordance with the centuries-old tradition of the Latin rite, the Latin language is to be retained by clerics in the divine office. But in individual cases the ordinary has the power of granting the use of a vernacular translation to those clerics for whom the use of Latin constitutes a grave obstacle to their praying the office properly. The vernacular version, however, must be one that is drawn up according to the provision of Art. 36.