Ars Nova is the title of an important musical treatise written by Philippe de Vitry about 1320. The first part of this treatise consists of discussions on intervals, the gamut, accidentals and the system of hexachords and mutations, in a conservative way. He sometimes quotes from statements of his precursors, such as Boethius, Lambertus, etc. It is, however, its latter part that is really significant. For it presents a thorough explanation of both binary and ternary mensuration and introduces a complete system of time signatures. Thus, this treatise has two contrasting aspects-the speculative and conservative and the practical and progressive. The curious harmony of this important musical treatise shows a remarkable feature of music at the beginning of the 14th century.

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