The Renaissance Reform of Medieval Music TheoryModern scholars have often portrayed the method of hexachordal solmization the sight singing method introduced by the 11th century monk Guido of Arezzo as the diatonic foundation of early music. Stefano Mengozzi challenges this view by examining a representative sample of the primary sources of solmization theory from Guido of Arezzo to Gioseffo Zarlino. These texts show that six syllable solmization was only an option for sight singing that never