It is considered as the golden age of a Capella music?

Madrigals

This was the golden age of the a cappella style. That means that singers sang without instruments. At this point in history, vocal music was still more important than instrumental music. Madrigals were popular during the Renaissance

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geography

this is because warmer climates often don't get people sick from the flu and regions where it was often colder more people received the flu. hope this if you need more reasoning i am here to