Since everything associated with the Mass must be beautiful, reflecting the infinite beauty and goodness of the God we worship, this applies in a special way to the music which forms an essential and integral part of our divine worship. In the words of Pope Francis:
Liturgical and sacred music can be a powerful instrument of evangelization, because it gives people a glimpse of the beauty of heaven.
Pope Benedict XVI states:
Certainly, the beauty of our celebrations can never be sufficiently cultivated, fostered and refined, for nothing can be too beautiful for God, Who is Himself infinite Beauty. Yet our earthly liturgies will never be more than a pale reflection of the liturgy celebrated in the Jerusalem on high, the goal of our pilgrimage on earth. May our own celebrations nonetheless resemble that liturgy as closely as possible and grant us a
foretaste of it!
Pope St. Pius X spoke of the artistic value of sacred music, another way of considering its intrinsic beauty:
[Sacred music] must be true art, for otherwise it will be impossible for it to exercise on the minds of those who listen to it that efficacy which the Church aims at obtaining in admitting into her liturgy the art of musical sounds.
(From “Sing to the Lord a New Song” by Abp. Alexander Sample, 2019; emphasis added)