The Mass was said according to the DOCTRINES of the Council of Trent (and, by the way, said without too many microphones then):
ON THE SACRIFICE OF THE MASS
Being the sixth under the Sovereign Pontiff, Pius IV., celebrated on the seventeenth day of September, MDLXII.
The sacred and holy, ecumenical and general Synod of Trent–lawfully assembled in the Holy Ghost, the same Legates of the Apostolic Sec presiding therein–to the end that the ancient, complete, and in every part perfect faith and doctrine touching the great mystery of the Eucharist may be retained in the holy Catholic Church; and may, all errors and heresies being repelled, be preserved in its own purity; (the Synod) instructed by the illumination of the Holy Ghost, teaches, declares; and decrees what follows, to be preached to the faithful, on the subject of the Eucharist, considered as being a true and singular sacrifice.
That the Sacrifice of the Mass is propitiatory both for the living and the dead.
On the Canon of the Mass. And whereas it beseemeth, that holy things be administered in a holy manner, and of all holy things this sacrifice is the most holy; to the end that it might be worthily and reverently offered and received, the Catholic Church instituted, many years ago, the sacred Canon, so pure from every error, that nothing is contained therein which does not in the highest degree savour of a certain holiness and piety, and raise up unto God the minds of those that offer. For it is composed, out of the very words of the Lord, the traditions of the apostles, and the pious institutions also of holy pontiffs.
On the solemn ceremonies of the Sacrifice of the Mass.
And whereas such is the nature of man, that, without external helps, he cannot easily be raised to the meditation of divine things; therefore has holy Mother Church instituted certain rites, to wit that certain things be pronounced in the mass in a low, and others in a louder, tone. She has likewise employed ceremonies, such as mystic benedictions, lights, incense, vestments, and many other things of this kind, derived from an apostolical discipline and tradition, whereby both the majesty of so great a sacrifice might be recommended, and the minds of the faithful be excited, by those visible signs of religion and piety, to the contemplation of those most sublime things which are hidden in this sacrifice.
On Mass wherein the priest alone communicates.
The sacred and holy Synod would fain indeed that, at each mass, the faithful who are present should communicate, not only in spiritual desire, but also by the sacramental participation of the Eucharist, that thereby a more abundant fruit might be derived to them from this most holy sacrifice: but not therefore, if this be not always done, does It condemn, as private and unlawful, but approves of and therefore commends, those masses in which the priest alone communicates sacramentally; since those masses also ought to be considered as truly common; partly because the people communicate spiritually thereat; partly also because they are celebrated by a public minister of the Church, not for himself only, but for all the faithful, who belong to the body of Christ.
On not celebrating the Mass every where in the vulgar tongue; the mysteries of the Mass to be explained to the people.
Although the mass contains great instruction for the faithful people, nevertheless, it has not seemed expedient to the Fathers, that it should be every where celebrated in the vulgar tongue. Wherefore, the ancient usage of each church, and the rite approved of by the holy Roman Church, the mother and mistress of all churches, being in each place retained; and, that the sheep of Christ may not suffer hunger, nor the little ones ask for bread, and there be none to break it unto them, the holy Synod charges pastors, and all who have the cure of souls, that they frequently, during the celebration of mass, expound either by themselves, or others, some portion of those things which are read at mass, and that, amongst the rest, they explain some mystery of this most holy sacrifice, especially on the Lord’s days and festivals.
CANON VIII.–If any one saith, that masses, wherein the priest alone communicates sacramentally, are unlawful, and are, therefore, to be abrogated; let him be anathema.
CANON IX.–If any one saith, that the rite of the Roman Church, according to which a part of the canon and the words of consecration are pronounced in a low tone, is to be condemned; or, that the mass ought to be celebrated in the vulgar tongue only; or, that water ought not to be mixed with the wine that is to be offered in the chalice, for that it is contrary to the institution of Christ; let him be anathema.
They shall also banish from churches all those kinds of music, in which, whether by the organ, or in the singing, there is mixed up any thing lascivious or impure; as also all secular actions; vain and therefore profane conversations, all walking about, noise, and clamour, that so the house of God may be seen to be, and may be called, truly a house of prayer.