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New style of secular music that emerged in the later 14th c. in southern France and northern Italy. Genre consisted mainly of polyphonic songs in the formes fixes, especially ballades.
Called Ars subtilior (the more subtle manner or the subtler art) because of the refined style of these songs and the composers’ willingness to push musical possibilities to new extremes. Phrase derived in part from writings of composer and theorist Philippus de Caserta at the court of Avignon.
Rhythmic complexity – Caserta and others developed new notational signs and practices for more complex rhythms, including voices in contrasting meters, beats subdivided in multiple different ways, and syncopations. Rhythmic complexity of this music would not be matched until the 20th c.