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.
The works of many of the ninth century theorists such as Aurelian of Réomé, and Remy of Auxerre, suggest that some form of part-singing was practised in their day, though they leave us in confusion owing to the ambiguity of their language. The famous scholar Scotus Erigena (880) mentions organum, but in a passage that is difficult and obscure. Regino, abbot of Prum in 892, is the first to define consonance and dissonance in such a way as to leave no doubt that he considers them from the point of view of polyphony, that is to say, as sounds that are the result of two different notes sung simultaneously. In the works of Hucbald of St. Amand in Flanders, quite at the end of the century, if not well into the tenth (Hucbald died in 930 or 932, over ninety years of age), there is at last a definite and clear description of organum. The word organum is an adaptation of the name of the instrument on which the art could be imitated, or, perhaps, from which it partly originated, the organ; just as the Greeks coined a word from magadis.