Decoration
Stylish decoration yields beauty.
"Diacosmetic" (Greek diakosmese) might be more correct but seems unduly pedantic.
What is usually called "art" often involves both expression and decoration. Along with altruism and commitment, decoration immediately provides environment for reverence, whereas expression does so only as ancestor to intermediate realms. So decoration is at once more modest and more exalted than expression; modest in the simplicity of its modal progeny, but exalted in its proximity to the apex.
Symmetry, contrast and such familiar elements of what is traditionally called "aesthetics" obviously play a part in beauty.
Christian music does not mean setting Christian words to music; it means developing musical forms which accord with the nature of music, undistorted by the one-sided emphases that wrongdoers' compositions always display.