What, then, is the origin of the so-called Gregorian chant? There is hardly a more interesting question in the whole history of music, for this chant is the basis of the whole magnificent structure of mediaeval church song, and in a certain sense of all modern music, and it can be traced back unbroken to the earliest years of the Christian Church, the most persistent and fruitful form of art that the modern world has known. The most exhaustive study that has been devoted to this obscure subject has been undertaken by Gevaert, director of the Brussels Conservatory of Music, who has brought forward strong representation to show that the musical system of the early Church of Rome was largely derived from the secular forms of music practised in the private and social life of the Romans in the time of the empire, and which were brought to Rome from Greece after the conquest of that country B.C. 146. “No one to-day doubts,” says Gevaert, “that the modes and melodies of the Catholic liturgy are a precious remains of antique art.” “The Christian chant took its modal scales to the number of four, and its melodic themes, from the musical practice of the Roman empire, and particularly from the song given to the accompaniment of the kithara, the special style of music cultivated in private life. The most ancient monuments of the liturgic chant go back to the boundary of the fourth and fifth centuries, when the forms of worship began to be arrested in their present shape. Like the Latin language, the Greco-Roman music entered in like manner into the Catholic Church. Vocabulary and syntax are the same with the pagan Symmachus and his contemporary St. Ambrose; modes and rules of musical composition are identical in the hymns which Mesomedes addresses to the divinities of paganism and in the cantilenas of the Christian singers.” “The compilation and composition of the liturgic songs, which was traditionally ascribed to St. Gregory I., is in truth a work of the Hellenic popes at the end of the seventh and the beginning of the eighth centuries. The Antiphonarium Missarum received its definitive form between 682 and 715; the Antiphonarium Officii was already fixed under Pope Agathon (678-681).” In the fourth century, according to Gevaert, antiphons were already known in the East. St. Ambrose is said to have transplanted them into the West. Pope Celestine I. (422-472) has been called the founder of the antiphonal song in the Roman Church. Leo the Great (440-461) gave the song permanence by the establishment of a singing school in the neighborhood of St. Peter’s. Thus from the fifth century to the latter part of the seventh grew the treasure of melody, together with the unfolding of the liturgy. The four authentic modes were adaptations of four modes employed by the Greeks. The oldest chants are the simplest, and of those now in existence the antiphons of the Divine Office can be traced farthest back to the transition point from the