Plus, it wasn't right until 1030 that an Italian Benedictine monk named Guido d'Arezzo invented a four-line stave, applying his hand to recollect the strains. Lots of early medieval audio is usually a mystery. A lot of people with the period had been illiterate, so audio was handed on orally, https://www.youtube.com/watch?v=mbqCyyAD1ag