People are reverent, not music. Things are sacred, not music.
now I wonder if the person was thinking...hmm should the drumset go on the epistle side or the gospel side?
Sacred: I would assert that music is a thing (though an aural thing), and can, therefore, be sacred or not, depending on its reverential (see above) qualities. A Tallis mass, a Taverner votive antiphon, a Poulenc motet may all be sacred because of their purpose, their high creative value, their inherent exclusivity for naught but the worship of the All Holy. This makes them as sacred as a holy icon, a vestment, a liturgical book, and other things set aside for holy activities. The one thing that music lacks that other things used on the altar and in liturgy is that it doesn't seem to have occured to anyone to bless it! But for that, it is as sacred as any blessed item in the church. So, we speak, and rightly so, of Sacred Music. Sacred Music is not just music that happens to be performed at liturgy, it is sacred because of its artistic value as a gift from God, and its function as a sacred item, a sacred thing in worship. (Though yet another matter, into which also I shant delve, are those species of music used in worship which the spiritually discerning soul should know better than to permit because they are antithetcal to reverence (see above) and unworthy of the House of God.)
Things are sacred, not music.
I would assert that music is a thing (though an aural thing), and can, therefore, be sacred or not, depending on its reverential (see above) qualities.
... "sacred" music must also utilize text of the Mass Ordinary or Proper, or OT/NT text. I would add that it should be written for use during the Mass to distinguish it from, e.g., Brahms' Requiem.
What about music written for the Liturgy of the Hours or other non-Mass rites, such as the Benediction and Exposition of the Blessed Sacrament? Are you asserting that music for these is not sacred?
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