Church music is defined at Wikipedia as, "Church music may be defined as music written for performance in church, or any musical setting of ecclestiacal liturgy, or music set to words expressing propositions of a sacred nature, such as a hymn. This article covers music in the Judaeo-Christian tradition. For sacred music outside this tradition, see Religious music. See also Christian music."
Also with church music comes church jobs.
"St Augustine says that "To sing once is to pray twice" (Qui cantat, bis orat) literally "he who sings, prays twice", suggesting there can be thoughts expressed by the music in which a prayer is offered, separate from those expressed by the words of the prayer itself."