I’m pretty sure it’s psychological line
Because the line is being drawn in their head making it a psychological line
Guido d'arezzo contributed to the development of musical notation. Option B. This is further explained below.
Who is Guido d'arezzo ?
Generally, Guido d'arezzo aka Guido d'Arezzo, was an Italian High Medieval music theorist and educator who lived from from 991 to 1033.
In conclusion, He was a Benedictine monk who is widely recognized as the creator of the current staff notation, which profoundly impacted the evolution of Western musical notation and practice.
Read more about Guido d'arezzo
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organum, i'm almost 100% sure
(lemme know if it's right, i have the same question)
