By about major or minor scales were the tonal basis of most compositions. a. 1500 b. 1600 c. 1680 d. 1750

c. 1680

Explanation:

Major or minor scales were the main tonal basis of most compositions by the year of 1680, the great composers didn´t come untill the 18th century were the symphonies and other masterpieces were written, complexity and talent added up to create masterpieces that are heard up until this day.

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