Speculum musicae

work by Liège

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July 14, 2026

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The Speculum Musicae is a treatise that was once mistakenly attributed to Jean de Muris, a 14th-century French philosopher and mathematician known for his support of new musical styles and notation. However, it is now understood that the Speculum Musicae was written by Jacques de Liège. This work is notable for its critique of the musical innovations of the time, which were championed by figures like Philippe de Vitry. The field of musicology, the scholarly study of music, encompasses historical research, theory, and the analysis of musical phenomena.12

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…theorist Jacques de Liège, whose Speculum musicae (“The Mirror of Music”) extolls the virtues of the older masters of the Ars Antiqua.
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…theorist Jacques de Liège, whose Speculum musicae (“The Mirror of Music”) extolls the virtues of the older masters of the Ars Antiqua.
Read More