Three-part compositions were of four kinds: fauxbourdon, motet, rondeau and conduit, the last three being written also in four parts. Fauxbourdon was simply a three-voiced chant, the parts having similar motion, the upper and lower being parallel sixths and the middle in fourths with the discant. In the motet each voice had a text of its own. The rondo was secular and was developed from the folk-music of the day. The conduit was uncertain in form, secular in character, and, like the rondo, was written for either voices or instruments. The early French masters made extensive use of the parallel movement of voices, yet had plainly no conception of harmony founded on chords. They show a much clearer purpose in their contrapuntal writings wherein the imitations are plainly devised according to rules. But the entire musical product of France between 1100 and 1250 was the cold, mathematical work of academicians, who nevertheless served the cause of the tone art by laying down indispensable laws. The last great master of this school, William of Machaut, who wrote the celebrated Coronation Mass for the crowning of Charles V., flourished between 1284 and 1369. Naturally enough the teachings of the French spread into the provinces of Belgium, and there grew up a school from which the Netherland masters rose. The most prominent early Belgian composer was Dufay (1350-1432). This writer introduced secular melodies into his masses, forbade the use of consecutive fifths, and freely used interrupted canonic part writing, in which the imitation appears only at occasional effective places. His works show evidences of a vague groping after euphonic beauty. Antoine de Busnois, who died in 1482, was the last of these early masters. His works abound in clever use of the devices of imitation and inversion. His canonic writing is more finished and his harmony bolder than Dufay's. The character of the music produced at this time has been well described by Mr. Rockstro. He says: "At this period, representing the infancy of art, the subject, or canto fermo, was almost invariably placed in the tenor and sung in long sustained notes, while two or more supplementary voices accompanied it with an elaborate counterpoint, written like the canto fermo itself in one or other of the ancient ecclesiastical modes, and consisting of fugal passages, points of imitation, or even canons, all suggested by the primary idea, and all working together for a common end."