Answer:
The term is harmony.
Explanation:
The word harmony is used to refer to and order arrangement of voice parts. It can also refer (musically) to the simultaneous mixture of tones, or sounds (especially when blended into musical chord) such that it is pleasing to the ear;
When used as a cooperative expression, it means working together towards a common goal or having congruous relationship with other people.
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A collage is a technique of art production where the artwork is mad from and assemblage of different art media:true