Instruction on Sacred Music and Sacred Liturgy
Sacred Congregation for Rites - September 3, 1958
Source:
adoremus.org/1958Intro-sac-mus.html
- Accordingly, the playing of the organ, and all other instruments is forbidden for liturgical functions, except Benediction, during the following times:
a) Advent, from first Vespers of the first Sunday of Advent until None of the Vigil of Christmas;
b) Lent and Passiontide, from Matins of Ash Wednesday until the hymn Gloria in excelsis Deo in the Solemn Mass of the Easter Vigil;
c) the September Ember days if the ferial Mass and Office are celebrated;
d) in all Offices and Masses of the Dead.
- Only the organ may be used on the Sundays of Septuagesima, Sexagesima, and Quinquagesima, and on the ferial days following these Sundays.
- However, during the seasons, and days just mentioned, the following exceptions to the rule may be made:
a) the organ may be played, and other instruments used on holy days of obligation, and holidays (except Sundays), on the feasts of the principal local patron saint, the titular day, and the dedication anniversary of the local church, the titular or founder’s day of a religious congregation, and on the occasion of some extraordinary solemnity;
b) the organ only (including the harmonium or reed organ) may be used on the third Sunday of Advent, and the fourth Sunday of Lent, on Thursday of Holy Week during the Mass of Chrism, and during the solemn evening Mass of the Last Supper from the beginning to the end of the hymn Gloria in excelsis Deo;
c) the organ only may be used at Mass, and Vespers for the sole purpose of supporting the singing.
Local Ordinaries may determine more precisely the application of these prohibitions, and permissions according to the approved local or regional customs.
- Throughout the Sacred Triduum, from the midnight before Holy Thursday until the hymn Gloria in excelsis Deo of the Solemn Mass of the Easter Vigil, the organ or harmonium shall remain completely silent, excepting the instance mentioned in paragraph 83b.
Important note: This document is from 1958. There are other examples of more recent instructions from the Holy See, and if there seems to be a conflict between this one and the more recent ones, the more recent ones would overturn this one; provided they carry the same (or more) authority.
Here’s an example from
Paschalis Sollemnitatis in 1988
source:
adoremus.org/PaschalisSollemnitatis.html
and it does carry the same authority, so it does over-turn the earlier one when we see conflicts.
- “In Lent, the altar should not be decorated with flowers, and musical instruments may be played only to give necessary support to the singing.” [20] This is in order that the penitential character of the season be preserved.
I suggest following the link and reading the entire document.
Clearly, although the 1958 document forbade any instruments during Lent (exceptions noted), the 1988 document allows for some instrumental music but only to accompany the singing–in other words, the instruments should be “subdued” somewhat. Also, keep in mind that “may be played” does not mean “should be played” so if the pastor decides not to have the organ playing during Lent, he need not justify that to anyone else.
Remember that although liturgical norms may permit some playing of the organ during Lent and Advent, by no means does that indicate that they must be played.
As far as the difference goes between the Ordinary Form and the Extraordinary Form, I believe that the 1958 rules would apply to the OF. Remember that in most cases, the EF cannot be used during the Easter Triduum in parishes anyway, so the differences between the two forms doesn’t present much of a practical question.