The war over, the liturgical movement kept moving along. Special gatherings, “liturgical weeks” and days became common, as in the French cities Rouen and Lourdes and other cities. A Congress of Sacred Music in 1919 was attended by cardinals and bishops and “mitred [bishop-level] abbots.” Interest was building in high places.

Gregorian chant, approved vigorously by Pius X almost 20 years earlier, was being taught to children — a half million in New York City, to site a major effort. Lay people were being encouraged to receive communion at mass — another Pius X footprint — and were in some cases were reading Scripture at mass. Pius XI told of “lively satisfaction” at these developments.

In Holland, the best organized in these matters, every diocese clergy-staffed liturgical commissions established by their bishops.

The lights of the movement were beginning to shine — Dom Odo Casel (1886-1948), source in his Liturgy…