The hymns are one of the few places where we are allowed flexibility. We select appropriate hymns in the Liturgy of the Hours, just as we do in the Mass. Over the years, we made every attempt to match the hymns used in the Liturgy of the Hours books, but some hymns are not available because no suitable recording of them are known or most commonly, copyrights prohibit their free 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 that are free to use. God bless!