PDF Download • Extremely Rare! Organ Accompaniment Book (165 pages)
Including an “added bonus” I discovered while researching Julius Bas (an Italian musicologist and organist).
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.”