The Organum was a medieval musical practice in which a plainchant melody was sung with at least one added voice. In its early stages, an organum involved only two voices: the principalis, which was notated, and the organalis, which was a usually improvised part, sung at a parallel consonant interval. Eventually. composers started writing out these parts, adding more lines, freeing the voices from the exclusively parallel movement and, in short, setting the bases of modern counterpoint.

Browse music by instruments

Browse music by composers

Browse music by periods