Pre-Reformation, Pre-Tridentine Mass: https://www.youtube.com/watch?v=UTSJ7LqZLYQ
Falso accusantur ecclesiae nostrae, quod missam aboleant. Retinetur enim missa apud nos, et summa reverentia celebratur. Servantur et usitatae ceremoniae fere omnes, praeterquam quod Latinis cantionibus admiscentur alicubi Germanicae, quae additae sunt ad docendum populum. Nam ad hoc unum opus est ceremoniis, ut doceant imperitos (AC 24).
We refuse to be guided by those who are offended by our church customs. We adhere to them all the more firmly when someone wants to cause us to have a guilty conscience on account of them. It is truly distressing that many of our fellow Christians find the difference between Lutheranism and Roman Catholicism in outward things. It is a pity and dreadful cowardice when a person sacrifices the good ancient church customs to please the deluded American denominations just so they won’t accuse of being Roman Catholic! Indeed! Am I to be afraid of a Methodist, [or a non-denominational Christian, or a Calvinist, or an Evangelical], who perverts the saving Word, or ashamed in the matter of my good cause, and not rather rejoice that they can tell by our ceremonies that I do not belong to them? We are not insisting that there be uniformity in perception or feeling or taste among all believing Christians, neither dare anyone demand that everyone be of the same opinion as his in such matters; nevertheless, it remains true that the Lutheran liturgy distinguishes Lutheran worship from the worship of other churches to such an extent that the houses of worship of the latter look like lecture halls, [theaters or auditoriums], while our churches are in truth houses of prayer in which Christians serve the great God publicly before the world. . . . Someone may ask, “What would be the use of uniformity in ceremonies?” We would answer, “What is the use of a flag on the battlefield? Even though a soldier cannot defeat the enemy with it, he nevertheless sees by the flag where he belongs. We ought not to refuse to walk in the footsteps of our fathers” (C.F.W. Walther, Essay on Adiaphora in Essays for the Church: Volume I (St. Louis: Concordia Publishing House, 1992), p. 193-194).
As far as possible we should observe the same rites and ceremonies, just as all Christians have the same baptism and the same sacrament [of the altar] and no one has received a special one of his own from God (Luther, The German Mass).