=The Work of the Gallo-Belgic School=.—We note that many of the new ideas came into being at this time, all of them, however, tending toward the arranging of material or the preparing of it for the emotional style. The Canon, and the principle of Imitation, developed a set of strict rules which tended to produce more adequate command of material and assisted in shaping the Fugue; though we, in our own day, regard these rules as positively detrimental to the real expression of emotion, yet they were necessary adjuncts to the real command of _technic_. With Imitation came Counterpoint of a more highly developed form; an inevitable step toward the fugal style of the later polyphonic periods. And lastly came a use of _Folk-music melodies_ and the _Leading Tone_, important because they foreshadow the abandonment of the old Church Modes, and the _adoption of the Natural Scale_. This marks the important point in the Gallo-Belgic school; for with the introduction of the Natural Scale there came increasing tendency for emotional expression, which could never have occurred had the Church Modes retained their former position in music. The idea of this preparation of material for emotional development cannot be emphasized too strongly. Upon the Gallo-Belgic school rested the burden of preparing this material for the later schools, so that these could demonstrate to the world that while polyphonic music could not be surpassed as a means of expressing certain impersonal, almost religious emotions, it could not express to the fullest, the intimate, personal, emotional ideas of the romantic composers.