Editing Tridentine Mass (section)

== Different levels of solemnity of celebration ==
There are various forms of solemnity of celebration of the Tridentine Mass:
* [[Papal Mass]] ([[Latin (language)|Latin]]: ''Missa Pāpālis''): celebrated by the [[Pope]], served by a [[cardinal-bishop]] assisting priest, the [[Apostolic Deacon]], more [[cardinal-deacon]]s, and a [[greek-catholic]] deacon and subdeacon, in Latin and [[Greek language|Greek]], with many unique traditions and [[vestments]]. It is a higher form derivative of the pontifical high mass given the pope's position as the [[Pontifex maximus]].
* [[Pontifical High Mass]] ([[Latin (language)|Latin]]: ''Missa pontificalis''): celebrated by a [[bishop]] accompanied by an assisting priest, [[deacon]], [[subdeacon]], [[thurifer]], acolytes and other ministers, under the guidance of a priest acting as Master of Ceremonies. Most often the specific parts assigned to deacon and subdeacon are performed by priests. The parts that are said aloud are all chanted, except that the Prayers at the Foot of the Altar, which before the reform of Pope Pius V were said in the sacristy, are said quietly by the bishop with the deacon and the subdeacon, while the choir sings the Introit. The main difference between a pontifical and an ordinary High Mass is that the bishop remains at his cathedra almost all the time until the offertory.
* [[Solemn Mass|Solemn or High Mass]] ([[Latin (language)|Latin]]: ''Missa solemnis''): offered by a priest accompanied by a deacon and subdeacon and the other ministers mentioned above.
* [[Missa Cantata]] ([[Latin (language)|Latin]] for "sung mass"): celebrated by a priest without deacon and subdeacon, and thus a form of Low Mass, but with some parts (the three variable prayers, the Scripture readings, Preface, Pater Noster, and Ite Missa Est) sung by the priest, and other parts (Introit, Kyrie, Gloria, Gradual, Tract or Alleluia, Credo, Offertory Antiphon, Sanctus and Benedictus, Agnus Dei, and Communion Antiphon) sung by the choir. Incense may be used exactly as at a Solemn Mass with the exception of incensing the celebrant after the Gospel which is not done.
* [[Low Mass]] ([[Latin (language)|Latin]]: ''Missa privata''): the priest sings no part of the Mass, though in some places a choir or the congregation sings, during the Mass, hymns not always directly related to the Mass. Note: the term ''missa privata'' was discouraged in 1962 for the misunderstanding of ''privata'' to mean private/non-public rather than 'deprived' of the fullness of ceremony.<ref>Rubricae Generales Missalis Romani De Anno MCMLXII point 269</ref>

In its article "The Liturgy of the Mass", the 1917 ''[[Catholic Encyclopedia]]'' describes how, when [[concelebration]] ceased to be practised in Western Europe, Low Mass became distinguished from [[Solemn Mass|High Mass]]:<ref name=":2">{{CathEncy|wstitle=Liturgy of the Mass}}</ref>

:The separate celebrations then involved the building of many altars in one church and the reduction of the ritual to the simplest possible form. The deacon and subdeacon were in this case dispensed with; the celebrant took their part as well as his own. One server took the part of the choir and of all the other ministers, everything was said instead of being sung, the incense and kiss of peace were omitted. So we have the well-known rite of low Mass (''missa privata''). This then reacted on high Mass (''missa solemnis''), so that at high Mass too the celebrant himself recites everything, even though it be sung by the deacon, subdeacon, or choir.

On the origin of the "''Missa Cantata''", the same source gives the following information about the Tridentine concept at the time:<ref name=":2" />

:high Mass is the norm; it is only in the complete rite with deacon and subdeacon that the ceremonies can be understood. Thus, the rubrics of the [[Ordinary of the Mass]] always suppose that the Mass is high. Low Mass, said by a priest alone with one server, is a shortened and simplified form of the same thing. Its ritual can be explained only by a reference to high Mass. For instance, the celebrant goes over to the north side of the altar to read the Gospel, because that is the side to which the deacon goes in procession at high Mass; he turns round always by the right, because at high Mass he should not turn his back to the deacon and so on. A sung Mass (''missa Cantata'') is a modern compromise. It is really a low Mass, since the essence of high Mass is not the music but the deacon and subdeacon. Only in churches which have no ordained person except one priest, and in which high Mass is thus impossible, is it allowed to celebrate the Mass (on Sundays and feasts) with most of the adornment borrowed from high Mass, with singing and (generally) with incense.

A ''[[Missa brevis]]'' is a musical setting of a Mass where the choir and musicians do not perform some parts of the Ordinary of the Mass they potentially could, such as the Gloria or Creed. This is not related to the distinctions above.