Given the significance of music in the Mass (i.e. music is an “integral part” or pars integrans), one would think that the Catholic church would have a music peculiar to itself. One would think the Catholic church would have a unique music that excelled in catholicity, that is, one would think that the Catholic church would be known by a music that distinguished itself by the qualities of universality and all-embracingness.
Does it seem a little strange that the musical experience of the majority of Catholics is anything but this?
Gregorian Chant is the music of the church. Gregorian chant is catholic music in the literal meaning of the word.
As a matter of fact, I would even assert that it is the only music that does not impose a specific national ethnicity on the one who sings it; Gregorian chant is not Celtic, it is not Italian, it is not Anglo, it is not German, it is not Eastern European. In my view, Gregorian Chant makes everyone equally comfortable (or uncomfortable) and that is because it does not belong to this or that tribe or family. It is the distinct music of the Catholic Church.
—from the blog post Is There Such a Thing as Catholic Music? by Mark Langley