Ars novae musicae

The Ars novae musicae (1319), meaning "The Art of the New Music," was a treatise written by Jean de Muris, a French philosopher and mathematician. This work was a significant proponent of the new musical style emerging in the 14th century, particularly in France.12

The Ars Nova period, named after a treatise by Philippe de Vitry, marked a departure from the earlier Ars Antiqua. Key innovations included greater rhythmic flexibility, moving beyond the triple meter dominance of the previous era, and the increased use of smaller note values. This period also saw a greater acceptance of thirds and sixths as harmonious intervals, alongside the established perfect consonances. Major composers of this era include Philippe de Vitry and Guillaume de Machaut in France, and in Italy, composers like Francesco Landini were prominent.23