“Promptly, Firmly, & Persistently Repressed.”
The book is called: “Cantica Sacra: Hymns for the children of the Catholic Church.”
Pope Saint Paul VI (3 April 1969): “Although the text of the Roman Gradual—at least that which concerns the singing—has not been changed, the Entrance antiphons and Communions antiphons have been revised for Masses without singing.”