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It usually refers to post-1950 compositions in which elements of the music were brought under the same type of control as pitch in twelve-tone music. The tone-row (the order in which the composer decides to arrange the 12 notes) can be expressed as numbers (a series) which can then be used to control parameters such as dynamics, rhythm, and attack.
The cog-wheel and rice plant stand for industry and agriculture. The stars represent the 14 states. Blue symbolizes peace. Red denotes courage. Effective date: 4 January 1974.
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