Guido o Arezzo
Frae Wikipedia
Guido o Arezzo kent as Guido Aretinus an aw, Guido da Arezzo or Guido Monaco (991/992 – efter 1033) wis a muisic theorist o Mediaeval times. He is thocht o as the inventor o modren muisical notation (staff notation) the notation that replaced neumatic notation; his text, the Micrologus, wis the seicont-maist-widely distreibute wark on muisic in the Middle Ages (efter the writins o Boethius).