The Church’s norms on sacred music have
not been superseded, and were in fact defended just last year in a Declaration issued by bishops, priests, and liturgical and musical scholars. You can read the Declaration and find a link to the names of the 200+ signatories here:
RORATE CÆLI: International Declaration on Sacred Music
Because what you claim is too much at odds with what I see and what I have been taught. You can keep quoting that 100 year-old document all you want, but until you find some modern confirmation and reaffirmation of those rules and some explanation of why they are not enforced, I will continue to believe that they have been superseded.
On the contrary, Pope John Paul II confirmed that the
Moto Proprio Tra le Sollecitudini remains in force as recently as 2003; see here:
Chirograph for the Centenary of the Motu Proprio Tra le Sollecitudini On Sacred Music (December 3, 2003) | John Paul II
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Sorry, but that’s a fail too. The first document you cite is not authoritative, but expresses the opinion of the signatories, who are: “over 200 musicians, pastors, and scholars.” That’s not how Roman Catholic discipline is defined.
And the second document you cite, while authoritative, does not say what you claim. It affirms the
spirit of
Tra le Sollecitudini , but not all the specifics (of which there are many.) The words “piano” and “women” do not appear in the document, so it hard to say the document re-affirms the banning of the piano and the separation of men and women in choirs. This second document does cite a Vatican II document,
SACROSANCTUM CONCILIUM, which says:
In the Latin Church the pipe organ is to be held in high esteem, for it is the traditional musical instrument which adds a wonderful splendor to the Church’s ceremonies and powerfully lifts up man’s mind to God and to higher things.
But other instruments also may be admitted for use in divine worship, with the knowledge and consent of the competent territorial authority, as laid down in Art. 22, 52, 37, and 40. This may be done, however, only on condition that the instruments are suitable, or can be made suitable, for sacred use, accord with the dignity of the temple, and truly contribute to the edification of the faithful.
This does not ban the piano, provided the piano can be made suitable in accord with the dignity of the temple and contribute to the edification of the faithful. So it is up to competent authority, and by all evidence of common practice, it seems common authority has is large measure approved the use of the piano and other instruments. (And women and men singing together in a choir.)