File:Guido and Tedald.jpg

Summary
Guido of Arezzo and Tedald, Bishop of Arezzo, determining string lengths for the notes of the scale with a monochord, from a manuscript now in Vienna.
 * See also: File:Guido d'Arezzo apprenant monocorde Theobald.jpg Guido d'Arezzo apprenant monocorde Theobald.jpg