The islamic style of art prevailed and maintained a continuum of islamic cultural unity during the muslim empire’s rise and fall in a time span of roughly:
1400 years.
200 years.
1300 years.
1600 years.

I would say that the answer is 1600 years 
hope this helps 

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.