France’s ancient organum

One of the earliest documented forms of music in Europe is the French organum, a Gregorian chant that features a base and a second voice that sings the same melody parallel to the first at a constant interval. 
The French organum comes from the Middle Ages (the 5th century to the 15th century), as do early troubadour songs written in the southern French language of Occitan, trouvère songs–similar to troubadour songs but from northern France and written in French, and a kind of song called the motet, a harmonious chant-based form that which broke new cultural ground by blending the sacred and the secular. Watch the example in this video, and enjoy!