40. Great importance should therefore be attached to the use of singing in the celebration of the Mass, with due consideration for the culture of the people and abilities of each liturgical assembly. Although it is not always necessary (e.g., in weekday Masses) to sing all the texts that are of themselves meant to be sung, every care should be taken that singing by the ministers and the people is not absent in celebrations that occur on Sundays and on holy days of obligation.
116. At daily Mass, the above priorities should be followed as much as possible, in this order: dialogues and acclamations (Gospel Acclamation, Sanctus, Memorial Acclamation, Amen); litanies (Kyrie, Agnus Dei); Responsorial Psalm, perhaps in a simple chanted setting; and finally, a hymn or even two on more important days. Even when musical accompaniment is not possible, every attempt should be made to sing the acclamations and dialogues.
115. By “Mass with a congregation” is meant a Mass celebrated with the participation of the faithful. It is moreover appropriate, whenever possible and especially on Sundays and holy days of obligation, that the celebration of this Mass take place with singing and with a suitable number of ministers. It may, however, also be celebrated without singing and with only one minister.
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