Guillaume de Machaut in the context of "Motive (music)"

In music, a motif (/moʊˈtiːf/ ) or motive is a short musical idea, a salient recurring figure, musical fragment or succession of notes that has some special importance in or is characteristic of a composition. The motif is the smallest structural unit possessing thematic identity.

A virelai is a form of medieval French verse used often in poetry and music. It is one of the three formes fixes (the others were the ballade and the rondeau) and was one of the most common verse forms set to music in Europe from the late thirteenth to the fifteenth centuries.

One of the most famous composers of virelai is Guillaume de Machaut (c. 1300–1377), who also wrote his own verse; 33 separate compositions in the form survive by him. Other composers of virelai include Jehannot de l'Escurel, one of the earliest (d. 1304), and Guillaume Dufay (c. 1400–1474), one of the latest.

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.

Messe de Nostre Dame (Mass of Our Lady) is a polyphonic mass composed before 1365 by French poet and composer Guillaume de Machaut (c. 1300–1377). Widely regarded as one of the masterpieces of medieval music and of all religious music, it is historically notable as the earliest complete setting of the Ordinary of the Mass attributable to a single composer (in contrast to earlier compilations such as the Tournai Mass).

The formes fixes (French: [fɔʁm fiks]; singular: forme fixe, "fixed form") are the three 14th- and 15th-century French poetic forms: the ballade, rondeau, and virelai. Each was also a musical form, generally a chanson, and all consisted of a complex pattern of repetition of verses and a refrain with musical content in two main sections.

All three forms can be found in 13th-century sources, but a 15th-century source gives Philippe de Vitry as their first composer while the first comprehensive repertory of these forms was written by Guillaume de Machaut. The formes fixes stopped being used in music around the end of the 15th century, although their influence continued (in poetry they, especially the rondeau, continued to be used).

A chanson (UK: /ˈʃɒ̃sɒ̃/, US: /ʃɑːnˈsɔːn/; French: chanson française [ʃɑ̃sɔ̃ fʁɑ̃sɛːz] , lit. 'French song') is generally any lyric-driven French song. The term is most commonly used in English to refer either to the secular polyphonic French songs of late medieval and Renaissance music or to a specific style of French pop music which emerged in the 1950s and 1960s. The genre had origins in the monophonic songs of troubadours and trouvères, though the only polyphonic precedents were 16 works by Adam de la Halle and one by Jehan de Lescurel. Not until the ars nova composer Guillaume de Machaut did any composer write a significant number of polyphonic chansons.

A broad term, the word chanson literally means "song" in French and can thus less commonly refer to a variety of (usually secular) French genres throughout history. This includes the songs of chansonnier, chanson de geste and Grand chant; court songs of the late Renaissance and early Baroque music periods, air de cour; popular songs from the 17th to 19th century, bergerette, brunette, chanson pour boire, pastourelle, and vaudeville; art song of the romantic era, mélodie; and folk music, chanson populaire (fr). Since the 1990s, the term may be used for Nouvelle Chanson, a French song that often contains poetic or political content.

Jehan de Lescurel (fl. early 14th century; also Jehannot de l'Escurel) was a composer-poet of late medieval music. Jehan's extensive surviving oeuvre is an important and rare examples of the formes fixes before the time of Guillaume de Machaut; it consists of 34 works: 20 ballades, 12 rondeaus and two long narrative poems, diz entés. All but one of his compositions is monophonic, representing the end of the trouvère tradition and the beginning of the polyphonic ars nova style centered around the formes fixes.