Boethius, De musica, f.43v, (211 x 144 mm), 12th century, Alexander Turnbull Library, MSR-05.
This is a manuscript about the theory of music. It was copied probably in England at Christ Church, Canterbury, in the second quarter of the twelfth century. Its main focus is the mathematical basis of music, and the beautifully-drawn diagrams with their graceful arches illustrate the mathematical ratios which produce the various intervals in the musical scale. Sometimes these diagrams take on animal forms such as here.
Boethius, the author of this work, was born about 480 into an aristocratic Roman family. He wrote a number of works but his treatise on music, De musica, was one of his earliest, written probably in the first decade of the sixth century.
"The science of numbers ought to be preferred as an acquisition before all others, because of its necessity and because of the great secrets and other mysteries which there are in the properties of numbers. All sciences partake of it, and it has need of none." - [Boethius]
See Also
musical scale
music
Ramsay - PLATE VIII - The Mathematical Table of Majors and Minors and their Ratio Numbers
scale