"The use of the Latin language, customary in a considerable portion of the Church, is a manifest and beautiful sign of unity, as well as an effective antidote for any corruption of doctrinal truth. It is neither wise nor laudable to reduce everything to antiquity by every possible device. Thus, to cite some instances one would be straying from the straight path were he to wish the altar restored to its primitive table form; were he to want black excluded as a color for the liturgical vestments; were he to forbid the use of Sacred Images and Statues in the Churches... [and] lastly were he to disdain and reject polyphonic music or singing in parts, even where it conforms to regulations issued by the Holy See.
That We make no delay in this matter is rendered necessary especially by the fact that the partisans of error are to be sought not only among the Church's open enemies; they lie hid, a thing to be deeply deplored and feared, in her very bosom and heart, and are the more mischievous, the less conspicuously they appear."- Venerable Pope Pius XII, in his Encyclical Mediator Dei, just shortly before the opening of the Second Vatican Council.
It's truly manifest that every single one of these errors listed has been fulfilled to the last stroke of a pen in the Catholic Church over the last fifty years. Just some food for thought.