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It is noticeable that, not long afterwards, when Guido D'Arezzo had penetrated deeper into the mysteries of the musical art, that art was misunderstood by the uncomprehending, and thought to be a subject for mathematical speculation, so that its true essence was utterly misapprehended, just as it was barely commencing to unfold itself.

Guido d'Arezzo, the famous sight-reading music teacher of the eleventh century, advised his pupils to "exercise the hand in the use of the monochord," showing his knowledge of the keyboard.

To Guido d'Arezzo is ascribed its development up to some semblance of our present system, although the claim has often been denied.

His attempt to reconstruct the musical scale was afterwards overshadowed by the system invented by Guido d'Arezzo, and it is therefore unnecessary to describe it in detail.