The Gregorian Missal is intended for the faithful who participate in Mass sung in Gregorian chant. It is useful both for choirs and for the people in general, since the proper chants of the Gregorian repertory, as presented in the post-Vatican II edition of the Roman Gradual approved by Pope Paul VI, do not, as a rule, correspond to the song texts proposed in the present day Roman Missal.
Peragitur autem a schola et populo alternatim, vel simili modo a cantore et populo, vel totus a populo vel a schola sola. Adhiberi potest sive antiphona cum suo psalmo in Graduali romano vel in Graduali simplici exstans, sive alius cantus, actioni sacræ, diei vel temporis indoli congruus,55 cuius textus a Conferentia Episcoporum sit approbatus.
Si ad introitum non habetur cantus, antiphona in Missali proposita recitatur sive a fidelibus, sive ab aliquibus ex ipsis, sive a lectore, sin aliter ab ipso sacerdote, qui potest etiam in modum monitionis initialis (cf. n. 31) eam aptare.
Quod reliquum est, licet textus Gradualis Romani, ad cantum saltem quod attinet, nοn fuerit mutatus, tamen, facilioris intellectus gratia, sive Psalmus ille Responsorius, de quο S. Augustinus et S. Leo Magnus saepe commermorant, sive Antiphonae ad Introitum et ad Communionem in Missis lectis adhibendae, pro opportunitate, instaurata sunt.
Even though the text of the Roman Gradual, at least that which concerns the singing, has not been changed, still, for a better understanding, the responsorial psalm, which St. Augustine and St. Leo the Great often mention, has been restored, and the Introit and Communion antiphons have been adapted for read Masses.
It is important to note at this point that option one for the Entrance chant has been amended as of November 2007 by the US Bishops so that the antiphon provided in the Roman Missal is no longer among the sung possibilities for the Entrance chant. The antiphon in the Roman Missal was never intended to be sung but rather to be recited when no singing occurred. This amendment also applies to what is currently in the General Instruction for the Offertory and Communion chant. Confirmation of this amendment awaits a recognition of the Holy See.
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