Two topics of interest, published Mass settings and musical instruments:
393. Bearing in mind the important place that singing has in a celebration as a necessary or integral part of the Liturgy,[Cf. Sacrosanctum Concilium 112] all musical settings for the texts of the Ordinary of Mass, for the people’s responses and acclamations, and for the special rites that occur in the course of the liturgical year must be submitted to the Secretariat of Divine Worship of the United States Conference of Catholic Bishops for review and approval prior to publication. While the organ is to be accorded pride of place, other wind, stringed, or percussion instruments may be admitted into divine worship in the Dioceses of the United States of America, according to longstanding local usage, in so far as these are truly suitable for sacred use, or can be made suitable.
Unpublished music not mentioned here. Also not mentioned are the standards for BCDW approval. One might expect or propose the three judgments, but is musical competence part of the expectation of episcopal ministry these days?
And interesting too is the suggestion that any instrument that can be made suitable for sacred use may be admitted to the liturgy.
Catholic Sensibility 
So this is where approval of settings of the music of the Ordinary of the Mass (and rituals that are part of the Mass) is covered; approval of settings of the propers and the substitutes therefore is covered in the respective paragraphs treating them.