De musica sacra et sacra liturgia
Instruction on Sacred Music and Sacred Liturgy
Sacred Congregation for Rites — 3 September, 1958
3. There are two kinds of Masses: the "sung Mass" and the ''read Mass."
The Mass is called a "sung Mass" if the priest celebrant actually sings those parts which are to be sung according to the rubrics. Otherwise it is a "read Mass."
Furthermore, if a sung Mass is celebrated with the assistance of sacred ministers, it is called a solemn Mass. If it is celebrated without the sacred ministers it is called a "Missa cantata."
SECOND VATICAN ECUMENICAL COUNCIL
MUSICAM SACRAM
INSTRUCTION ON MUSIC IN THE LITURGY
5 March, 1967
28. The distinction between solemn, sung and read Mass, sanctioned by the Instruction of 1958 (n. 3), is retained, according to the traditional liturgical laws at present in force. However, for the sung Mass (Missa cantata), different degrees of participation are put forward here for reasons of pastoral usefulness, so that it may become easier to make the celebration of Mass more beautiful by singing, according to the capabilities of each congregation.
Of course even where there was a Solemn Mass, the roles of deacon and subdeacon would be filled by priests.
...what.... of the historical usage of the *organ*?
isn't a common term, though Frescobaldi might be imagining filling in for the Gradual in the absence of a choir. His Fiori provides for:Interludes between readings
Or did I make it up in my head?
For the OF GIRM appears to include it, and I see no reason why not. The preface of a book is part of the book I think. The rubrics, and indeed the very text, indicate that the Sanctus is uttered by the celebrant, even though 'we' join in, though singing may obscure that.The rubrics of our present Missal leave no doubt as to the limits of the Canon in modern times†. It begins at the "Te Igitur" and ends with the Amen before the Embolism of the Pater Noster (omnis honor et gloria, per omnia sæcula sæculorum, Amen). The Missal has the title "Canon Missæ" printed after the Sanctus, and the Rubrics say: "After the Preface the Canon of the Mass begins secretly" † 1917
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