Polyphony was practically foreign to the music of the Greeks. They had observed, it is true, that a chorus of men and boys produced a different quality of sound from that of a chorus made up of all men or all boys, and they had analyzed the difference and found the cause of it to be that boys’ voices were an octave higher than men’s; and that boys and men singing together did not sing the same notes. This effect, which they also imitated with voices and certain instruments they called _Antiphony_, and they considered it more pleasing than the effect of voices or instruments in the same pitch which they called _Homophony_. The practice of making music in octaves was called _magadizing_, from the name of a large harp-like instrument, the magadis, upon which it was possible. But magadizing cannot be considered the forerunner of polyphony, for, though melodies an octave apart may be considered not strictly the same, still they pursue the same course and are in no way independent of each other; and the effect of a melody sung in octaves differs from the effect of one sung in unison only in quality, not at all in kind. The allegiance of theorists to Greek culture all through the Middle Ages and the Renaissance has tended to conceal the actual origin of polyphony, but as early as 1767 J. J. Rousseau wrote in his _Dictionnaire de musique_, 'It is hard not to suspect that all our harmony is an invention of the Goths or the Barbarians.’ And later: 'It was reserved to the people of the North to make this great discovery and to bequeath it as the foundation of all the rules of the art of music.’ The kernel from which the complicated science of polyphony sprang is simple to understand. One voice sang a melody, another voice or an instrument, starting with it, wove a counter-melody about it, elaborated by the flourishes and melismas which are still dear to the people of the Orient. Some such sort of primitive improvisation seems to have been practised by the people of northern Europe, and to have been taken over by the church singers. The later art of _déchant sur le livre_ or improvised descant was essentially no different and seems to have been of very ancient origin. The early theorists naturally took it upon themselves to regulate and systematize the popular practice, and thereupon polyphony first comes to our notice through their works in a very stiff and ugly form of music called _organum_, which in its strictest form is hardly more to be considered polyphony than the magadizing of the Greeks.