Answer:
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C - Guillaume De Machaut
It was composed before 1365 by this French composer.
Hope this helps!
Answer: Cowell
Explanation:
The first one who experimented with piano strings and clusters is Henry Cowell.
He was the first one who asked the pianist to manipulate string and then when he discovered the sound.
Before that new sound, he discovered also <u>tone clusters</u>. Tone clusters were achieved by hitting the piano keys with elbows or fists.
The exposition in sonata-allegro form is an optional ending in the tonic key.
