Léonin

Léonin was a 12th-century French composer associated with the Notre-Dame school. He is traditionally credited with composing the Magnus liber organi, a collection of polyphonic music for church services.

Organum: A medieval musical practice in which one or more voices sing alongside a chant melody. Léonin’s surviving reputation centers on the development of elaborate organum.
Florid organum: A style of organum in which a sustained chant note supports many rapidly moving notes in another voice. This texture is especially associated with the Notre-Dame repertory linked to Léonin.
Anonymous IV: An English music theorist of the late 13th century, known through an anonymous treatise describing Notre-Dame musicians. This source names Léonin and reports his association with the Magnus liber organi.
Mensural notation: A system of music notation that indicates relative note durations with greater precision than earlier notation. The rhythmic practices of Notre-Dame music form part of the longer history leading toward mensural notation.
Notre-Dame school: A group of composers and musical practices associated with Paris’s Notre-Dame Cathedral around the late 12th and early 13th centuries. Léonin is traditionally identified as an early member of this Parisian musical milieu.
Discant: A style of medieval polyphony in which voices move in coordinated rhythm, often note against note. Notre-Dame composers contrasted measured discant with more freely flowing organum.
Perotinus: A composer associated with the Notre-Dame school around the turn of the 13th century. Anonymous IV presents Perotinus as a successor who revised and expanded work attributed to Léonin.
Ars antiqua: A broad label for European polyphonic music of the 12th and 13th centuries, especially Notre-Dame repertory. Léonin’s music is commonly situated within this period of early written polyphony.
Magnus liber organi: A collection of organum for the liturgical year associated with the Notre-Dame musical tradition. Anonymous testimony credits Léonin with compiling this influential collection.
Rhythmic modes: A system of recurring rhythmic patterns used in medieval music notation and performance. They helped singers coordinate the measured passages in Notre-Dame polyphony.

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