Your two best options are:
ensures that the 12 notes are given equal important.
and:
is characterized by the works of Arnold Schoenberg.
the twelve-tone technique was made by Arnold Schoenberg and is also called "serialism" and "dodecaphony." It's a method that rejects keys.
I believe the answer is 1990. If you are not sure about my answer just google it.
Answer:
The first people to do so were the Akkadian's king Sargon (reigned 2334–2284 BCE). He conquered the cities of Sumer and brought them under one system of government.
Explanation:
