"Motu proprio" sur la musique sacrée
Publisher: Desclée, De Brouwer
Published: 1928
Place of publication: Bruges
Language: fre
Number of pages: 44
Subjects: Church music; Catholic Church; Gregorian chants; History and criticism
Notes: "Supplément à la revue Musica sacra, Septembre 1928."

The Motu proprio was first published 22 November 1903.

A translation of Pius X's motu proprio, Tra le sollecitudini.