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Musica libris quatuor demonstrata - LEFÃVRE D'ÃTAPLES, Jacques] (or Jacobus - 1552. 
Printer's device on title and many tables & woodcut diagrams in the text. 44 numbered leaves. Small 4to, attractive speckled half-calf & speckled boards, spine gilt, red morocco lettering piece on spine. Paris: G. Cavellat, 1552. First separate edition; first published in 1496 as part of a larger work, and several times reprinted in that form, including once by Estienne in 1514. This is study of the mathematical theory of music, by the great French humanist, theologian, and commentator on Aristotle, LefÃ¨vre d'Ãtaples (ca. 1455-1537). "He went no further than Boethius, but he made clearer divisions and gave a full commentary to each principle. Unlike Boethius, he succeeded in showing that the small semitone is larger than three Pythagorean commas and smaller than four, using calculations of 33 digitsâ¦Faber was more concerned with the mathematical laws of music than with performing skills. Many music theorists of the 16th century to the 18th either referred to Faber or quoted him."-New Grove, Vol. 6, p. 345. Fine condition.
[Bookseller: Jonathan A. Hill, Bookseller, Inc.]
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