 Guido of Arezzo

Guido of Arezzo (also Guido Aretinus, Guido Aretino, Guido da Arezzo, Guido Monaco, Guido d'Arezzo,Guido Monaco Pomposiano, or Guy of Arezzo also Guy d'Arezzo) (991/992 – after 1033) was an Italian music theorist of the Medieval era.He is regarded as the inventor of modern staff notation that replaced neumatic notation.