There are two normal meters used in office hymns, Ambrosian = Church Meter = Long Meter = 8.8.8.8. iambic, and Sapphic or 11.11.11.5. There are a few exceptions but not many.
the Mundelein Psalter has approval of the USCCB to be used throughout the United States
Can. 838 §1. The direction of the sacred liturgy depends solely on the authority of the Church which resides in the Apostolic See and, according to the norm of law, the diocesan bishop.
§2. It is for the Apostolic See to order the sacred liturgy of the universal Church, publish liturgical books and review their translations in vernacular languages, and exercise vigilance that liturgical regulations are observed faithfully everywhere.
§3. It pertains to the conferences of bishops to prepare and publish, after the prior review (recognitio) of the Holy See, translations of liturgical books in vernacular languages, adapted appropriately within the limits defined in the liturgical books themselves.
§4. Within the limits of his competence, it pertains to the diocesan bishop in the Church entrusted to him to issue liturgical norms which bind everyone.
In order to preserve the integrity of the truths of faith and morals, the pastors of the Church have the duty and right to be watchful so that no harm is done to the faith or morals of the Christian faithful through writings or the use of instruments of social communication. They also have the duty and right to demand that writings to be published by the Christian faithful which touch upon faith or morals be submitted to their judgment and have the duty and right to condemn writings which harm correct faith or good morals.
the funereal tempo at which it is customarily sung.
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