Franco of Cologne

German author and musician

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June 26, 2026

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Franco of Cologne was a 13th-century German music theorist who played a crucial role in the development of musical notation. He is credited with organizing and codifying the mensural system, a more precise method of rhythmic notation that is a direct ancestor of modern musical notation. His influential treatise, Ars cantus mensurabilis ("The Art of Measured Song"), helped establish the time values for notes and rests, including the long, breve, and semibreve. This system allowed for greater rhythmic complexity and clarity in musical compositions, moving away from the more ambiguous notation of earlier periods.12

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counterpoint
Counterpoint in the Middle Ages
The theorist Franco of Cologne advocated the use of consonance at the beginning of each measure; such consonances (usually a chord made up of the unison, fifth, and octave, such as C–G–C) served as fixed pillars in terms of which the horizontal extensions of different rhythmic lengths…
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The theorist Franco of Cologne advocated the use of consonance at the beginning of each measure; such consonances (usually a chord made up of the unison, fifth, and octave, such as C–G–C) served as fixed pillars in terms of which the horizontal extensions of different rhythmic lengths…
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musical notation
Mensural notation
…around 1260 by influential theorist Franco of Cologne. The notes then in use included the duple long, later called maxima (𝆶); long (𝆷); breve (𝄺); and semibreve (𝆺). In French music a shorter note value was created: the minim (𝆺𝅥).
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…around 1260 by influential theorist Franco of Cologne. The notes then in use included the duple long, later called maxima (𝆶); long (𝆷); breve (𝄺); and semibreve (𝆺). In French music a shorter note value was created: the minim (𝆺𝅥).
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conductus
The 13th-century commentator Franco of Cologne distinguished between conductus cum and sine littera (with and without words); while the former was in simple syllabic style, the latter was not only untexted but, in some instances, quite florid in nature and hence suitable for use as caudae (singular cauda),…
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The 13th-century commentator Franco of Cologne distinguished between conductus cum and sine littera (with and without words); while the former was in simple syllabic style, the latter was not only untexted but, in some instances, quite florid in nature and hence suitable for use as caudae (singular cauda),…
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Ars Antiqua
…known music for four voices; Franco of Cologne (flourished mid-13th century), a theorist, whose Ars cantus mensurabilis (“The Art of Measured Song”) served to organize and codify the newly formed mensural system (a more precise system of rhythmic notation, the direct ancestor of modern notation); and Pierre de la Croix…
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…known music for four voices; Franco of Cologne (flourished mid-13th century), a theorist, whose Ars cantus mensurabilis (“The Art of Measured Song”) served to organize and codify the newly formed mensural system (a more precise system of rhythmic notation, the direct ancestor of modern notation); and Pierre de la Croix…
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