The Byzantine style of are developed in? A. Medieval Europe
B. Ancient Greece
C. The Minoan civilization
D. The eastern Roman Empire

It started in the Eastern Roman Empire! It’s C. Only because the Byzantine empire development started during the Roman Empire and continued for a time period until the empire fell into its knees! (metaphorically)

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.