Ars subtilior  Ars subtilior (Latin for 'subtler art') is a musical style characterized by rhythmic and notational complexity, centered on Paris, Avignon in southern France, and also in northern Spain at the end of the fourteenth century. The style also is found in the French Cypriot repertory. Often the term is used in contrast with ars nova, which applies to the musical style of the preceding period from about 1310 to about 1370; though some scholars prefer to consider the ars subtilior a subcategory of the earlier style. Primary sources for the ars subtilior are the Chantilly Codex, the Modena Codex (Mod A M 5.24), and the Turin Manuscript (Torino J.II.9). Musically, the productions of the ars subtilior are highly refined, complex, difficult to sing, and probably were produced, sung and enjoyed by a small audience of specialists and connoisseurs. Hoppin suggests the superlative "ars subtilissima", saying, "not until the twentieth century did music again reach the most subtle refinements and rhythmic complexities of the manneristic style." They are almost exclusively secular songs, and have as their subject matter love, war, chivalry, and stories from classical antiquity. There are even some songs written in praise of public figures (for example Antipope Clement VII). Daniel Albright compares avant-garde and modernist music of the 20th century's "emphasis on generating music through technical experiment" to the precedent set by the ars subtilior movement's "autonomous delight in extending the kingdom of sound." He cites Baude Cordier's perpetual canon "Tout par compas" (All by compass am I composed), notated on a circular staff. Albright contrasts this motivation with "expressive urgency" and "obedience to rules of craft" and, indeed, "ars subtilior" was coined by musicologist Ursula Günther in 1960 to avoid the negative connotations of the terms "manneristic style" and "mannered notation". (Günther's coinage was based on references in "Tractatus de diversis figuris", attributed to Philippus de Caserta, to composers moving to a style "post modum subtiliorem comparantes" and developing an "artem magis subtiliter".) One of the centers of activity of the style was Avignon at the end of the Babylonian Captivity of the Papacy and during the Great Schism (1378–1417), the time during which the Western Church had a pope both in Rome and in Avignon.