16 Thus, with the favor and under the auspices of the Church the study of sacred music has gone a long way over the course of the centuries. In this journey, although sometimes slowly and laboriously, it has gradually progressed from the simple and ingenuous Gregorian modes to great and magnificent works of art. To these works not only the human voice, but also the organ and other musical instruments, add dignity, majesty and a prodigious richness.
Source: Musicae Sacrae (Vatican.va)