https://www.newliturgicalmovement.org/2015/09/vatican-issues-new-ordo-cantus-officii.html
New Liturgical Movement: Vatican issues new Ordo Cantus Officii
Sacred liturgy and liturgical arts. Liturgical history and theology. The movements for the Usus Antiquior and Reform of the Reform.
new liturgical movementordo cantus officiivaticanissues