Brackets and parentheses are used (brackets in the case of whole Psalms, parentheses in the case of verses) to indicate Psalms and verses of Psalms which may be omitted. In some instances, the entire portion of the Psalter assigned to a given Office has been bracketed, and alternative Psalmody provided. Those who desire to recite the Psalter in its entirety should, in each instance, use the bracketed Psalms rather than the alternatives.
Antiphons drawn from the Psalms themselves, or from the opening sentences given in the Offices, or from other passages of Scripture, may be used with the Psalms and biblical Canticles. The antiphons may be sung or said at the beginning and end of each Psalm or Canticle, or may be used as refrains after each verse or group of verses.
On Special Occasions, the officiant may select suitable Psalms and Readings.
