Le traite anonyme du manuscrit hebreu 1037 de la Bibliotheque Nationale de Paris

This article is a translation and adaption of an article in Latin dealing mainly with 'Musica Plana' by Yehuda ben Rabbi Yizchak. The article includes a definition of music and an explanation of the Guidonian Hand system, hexachords and mutations, the seven melodic interval, the eight modes, mensural notation, the monochord. The article describes music theory prevalent since the 12th century, it was probably written in the 14th century in Southern France.