Medieval diatonicism, which did not include the principle of octave equivalence, was codified by Guido of Arezzo in the early 11th century: it acknowledged notes from G to e, arranged in seven overlapping hexachords .
Medieval diatonicism, which did not include the principle of octave equivalence, was codified by Guido of Arezzo in the early 11th century: it acknowledged notes from G to e, arranged in seven overlapping hexachords .