The hymns are one of the few places were we are allowed flexibility. Just as in the Mass we select appropriate hymns so we also do the Liturgy of the Hours. We make every attempt to match the hymns used in the Liturgy of the Hours books, but several hymns are not available because no suitable recording of them are known or copyrights prohibit their use. When we can't find and use a matching hymn we select available hymns that nourish prayer, have doctrinal and literary excellence, and are fitting to the Hour.
We are constantly in search of matching hymns. We hope that you will report back to us when you find suitable recordings.
We are actively seeking the hymns provided within the Mundelein Psalter because they are translations of very early hymns used in the Liturgy of the Hours and they are the most likely hymns to be used when the new translations are released in a few years.