50 pp. A bump to one corner. Inscribed by the editor to Saul Novack. Papal positions on liturgical music: Pius X--Tra le Sollicitudini (Among the concerned), Pius XI--Divini Cultus (On divine worship), and Pius XII--Musicae Sacrae Disciplina (Rules of Sacred Music). Concerning mostly the revival of Gregorian chant in the twentieth century.