Pencil with the Ut queant laxis of Guido d Arezzo. ' ' The use of Ut queant laxis to name the tones is usually attributed to Guido of Arezzo in the eleventh century, who proposed a name the tones of notes. ' ' Dimensions: 18cm Ø6,9mm Pencil in natural wood ' ' Pencil designed by Music Gift. ' ' Made at Viarco (the only pencil factory of the Iberian Peninsula).