62 As We have said before, besides those things that are intimately associated with the Church's sacred liturgy, there are also popular religious hymns which derive their origin from the liturgical chant itself. Most of these are written in the language of the people. Since these are closely related to the mentality and temperament of individual national groups, they differ considerably among themselves according to the character of different races and localities.
Source: Musicae Sacrae (Vatican.va)