Accent and Gregorian Melody
The idea of the tonic accent in Gregorian melody runs through the entire Solesmes tradition from Gontier to Pothier to Mocquereau to the present.
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.”