Let’s talk commissions:
68. The diocesan Commissions for sacred music are of most valuable assistance in promoting sacred music together with pastoral liturgical action in the diocese.
Therefore they should exist as far as possible in each diocese, and should unite their efforts with those of the liturgical Commission.
It will often be commendable for the two Commissions to be combined into one, and consist of persons who are expert in both subjects. In this way progress will be easier.
It is highly recommended that, where it appears to be more effective, several dioceses of the same region should set up a single Commission, which will establish a common plan of action and gather together their forces more fruitfully.
This is classic Vatican II talk: teamwork. It continues as we hit the end of Musicam Sacram:
69. The Liturgical Commission, to be set up by the Episcopal Conference as judged opportune,[SC 44] should also be responsible for sacred music; it should therefore also consist of experts in this field. It is useful, however, for such a Commission to confer not only with the diocesan Commissions, but also with other societies which may be involved in musical matters in the same region. This also applies to the pastoral liturgical Institute mentioned in art. 44 of the Constitution.
And an official endorsement to cap off the document:
In the audience granted on 9 February, 1967 to His Eminence Arcadio M. Cardinal Larraona, Prefect of the Sacred Congregation of Rites, His Holiness Pope Paul VI approved and confirmed the present Instruction by his authority, ordered it to be published and at the same time established that it should come into force on Pentecost Sunday 14 May, 1967.
Any last words?