Music of the Trecento in the context of "Western Classical music"

Classical music generally refers to the art music of the Western world, considered to be distinct from Western folk music or popular music traditions. It is sometimes distinguished as Western classical music, as the term "classical music" can also be applied to non-Western art musics. Classical music is often characterized by formality and complexity in its musical form and harmonic organization, particularly with the use of polyphony. Since at least the ninth century, it has been primarily a written tradition, spawning a sophisticated notational system, as well as accompanying literature in analytical, critical, historiographical, musicological and philosophical practices.

Rooted in the patronage of churches and royal courts in Europe, surviving early medieval music is chiefly religious, monophonic and vocal, with the music of ancient Greece and Rome influencing its thought and theory. The earliest extant music manuscripts date from the Carolingian Empire (800–887), around the time which Western plainchant gradually unified into what is termed Gregorian chant. Musical centers existed at the Abbey of Saint Gall, the Abbey of Saint Martial and Saint Emmeram's Abbey, while the 11th century saw the development of staff notation and increasing output from medieval music theorists. By the mid-12th century, France became the major European musical center: the religious Notre-Dame school first fully explored organized rhythms and polyphony, while secular music flourished with the troubadour and trouvère traditions led by poet-musician nobles. This culminated in the court-sponsored French ars nova and Italian Trecento, which evolved into ars subtilior, a stylistic movement of extreme rhythmic diversity. Beginning in the early 15th century, Renaissance composers of the influential Franco-Flemish School built on the harmonic principles in the English contenance angloise, bringing choral music to new standards, particularly the mass and motet. Northern Italy soon emerged as the central musical region, where the Roman School engaged in highly sophisticated methods of polyphony in genres such as the madrigal, which inspired the brief English Madrigal School.

Renaissance music is traditionally understood to cover European music of the 15th and 16th centuries, later than the Renaissance era as it is understood in other disciplines. Rather than starting from the early 14th-century ars nova, the Trecento music was treated by musicology as a coda to medieval music and the new era dated from the rise of triadic harmony and the spread of the contenance angloise style from the British Isles to the Burgundian School. A convenient watershed for its end is the adoption of basso continuo at the beginning of the Baroque period.

The period may be roughly subdivided, with an early period corresponding to the career of Guillaume Du Fay (c. 1397–1474) and the cultivation of cantilena style, a middle dominated by Franco-Flemish School and the four-part textures favored by Johannes Ockeghem (1410s or '20s–1497) and Josquin des Prez (late 1450s–1521), and culminating during the Counter-Reformation in the florid counterpoint of Palestrina (c. 1525–1594) and the Roman School.

Ars nova (Latin for 'new art') refers to a musical style which flourished in the Kingdom of France and its surroundings during the Late Middle Ages. More particularly, it refers to the period between the preparation of the Roman de Fauvel (1310s) and the death of composer Guillaume de Machaut in 1377. The term is sometimes used more generally to refer to all European polyphonic music of the fourteenth century. For instance, the term "Italian ars nova" is sometimes used to denote the music of Francesco Landini and his compatriots, although Trecento music is the more common term for the contemporary 14th-century music in Italy. The "ars" in "ars nova" can be read as "technique", or "style". The term was first used in two musical treatises, titled Ars novae musicae (New Technique of Music) (c. 1320) by Johannes de Muris, and a collection of writings (c. 1322) attributed to Philippe de Vitry often simply called "Ars nova" today. Musicologist Johannes Wolf first applied to the term as description of an entire era (as opposed to merely specific persons) in 1904.

The term ars nova is often used in juxtaposition to two other periodic terms, of which the first, ars antiqua, refers to the music of the immediately preceding age, usually extending back to take in the period of Notre Dame polyphony (from about 1170 to 1320). Roughly, then, ars antiqua refers to music of the thirteenth century, and the ars nova that of the fourteenth; many music histories use the terms in this more general sense.

The Squarcialupi Codex (Florence, Biblioteca Medicea Laurenziana, MS Mediceo Palatino 87) is an illuminated manuscript compiled in Florence in the early fifteenth century. It is named for the noted fifteenth-century organist Antonio Squarcialupi, who owned it.

It is the single largest primary source of secular polyphonic music of the Trecento – the Italian ars nova – and contains the largest surviving collection of the compositions of Francesco Landini. The illuminated portraits of the musicians are attributed to Lorenzo Monaco and his circle. It is not known by whom, for what purpose, nor under whose patronage the compilation was made.