Good points! A general avoidance of alleluia in the context of motets and hymns, either from Septuagesima or during Lent, is noted in any number of handbooks and commentaries, but I'm not sure I've seen any official rubric or regulation forbidding the use of motets or hymns with alleluia, which leads me to wonder whether it's a tradition so well known that it didn't need to be documented, or whether there is indeed no such prohibition regarding supplementary texts sung in the liturgy. To the OP, I find it a bit silly when choirs substitute something else in rehearsal to avoid uttering the forbidden word, but as long as they don't take it too seriously in a way that tends toward scrupulosity, I see no harm in it.it may be uttered outside of antiphons and the propers. When Easter falls in its somewhat typical range, the word is found of Prime of April 4 at the Marytrology, and it is always said in Lent in a reading of the second nocturn of Matins, on the feast of Saint Gregory.
To participate in the discussions on Catholic church music, sign in or register as a forum member, The forum is a project of the Church Music Association of America.