Which rubric has precedence?

[japhy]

Also, based off of japhy’s posts, if the dates are correct, then an argument could be made that Musicam Sacram does not apply to the Missal of Paul VI since it was promulgated prior to the Missal’s promulgation.

I wouldn’t go so far as to say that Musicam Sacram does not apply at all to the Ordinary Form of the Mass. It applies mutatis mutandi (changing what must be changed).

But yes, the most recent liturgical legislation overrides previous legislation where there is a conflict.