Maybe if I present it
less succinctly that will help.
As
Fortescue and most other commentators would say, the true difference between a “high Mass” and a “low Mass” is that a high Mass is celebrated with deacon and subdeacon, while a low Mass is only celebrated by the priest (and altar servers, as appropriate). The high Mass (which the Latin books call
missa solemnis, and those who don’t know better would call “Solemn High Mass”) is always chanted by the sacred ministers and sung by the choir. “Low Mass,” on the other hand, can be further divided into the
missa lecta (“said Mass,” or spoken Mass) and
missa cantata (“sung Mass”).
Originally the
missa lecta was the only form of low Mass, so that the only two possibilities for Mass were the big-production
missa solemnis, with its requirement of a deacon and subdeacon and choir, or the silent
missa lecta, suitable for a side altar on a Tuesday but hardly impressive. As time went by, in many places, like parishes, they wanted things like singing and incense, but simply did not have a deacon and subdeacon available. So gradually in the eighteenth century the
missa cantata was created as an elevated form of the low Mass, or really a hybrid Mass. The Holy See still tried to keep a few distinctions between the
missa cantata and
missa solemnis; for instance, the use of incense was forbidden at the
missa cantata – a prohibition that was widely ignored, until finally in the early 20th century the Holy See capitulated, allowing it as an option. Sadly, the use of incense at a
missa cantata will forever be stigmatized as the fruit of disobedience.
Anyway – setting aside, as we have been, all pontifical forms of the Mass – what you have now are three forms, which can be celebrated as differently as night and day, and have plenty of options to go along with them. There is the true high Mass – the
missa solemnis – at which the priest’s parts must be chanted and the propers and ordinary sung. Six candles are used. There is the false high Mass – the
missa cantata, sometimes erroneously advertised as “high Mass” on parish or chapel websites – at which, again, the priest’s parts must be chanted and the propers and ordinary sung. Four or six candles are used. Then there is the true low Mass – the
missa lecta – at which the priest’s parts must
not be chanted and the propers and ordinary must
not be sung. Two candles are used, except on occasions of greater solemnity, when more can be used. At the
missa lecta, however, as I intimated in my previous post, other songs or hymns, including vernacular paraphrases of the propers (but, again,
not the propers themselves) may be sung.
Is that clearer?