Giulio Bas was best known for his Gregorian accompaniments. Here’s a biography of him written in 1907 (approximately a decade before his accompaniments began to appear):
* * 1907 Biography of Julius Bas
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.”