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Answer:
Musicals include every person's voice and their voices are incorporated in to one song that is trying to tell some form of a story. It wouldn't be a musical if there were one person right? So the "collaborative" part induces the fact that it is a musical with multiple roles for singing and acting. I hope this will help you, this answer came truly from me. Thank you.
The mid -1900’s was when it’s began to increase
A visual artist is someone was able to truly progress and understand the Arts visually and emotionally so that they will be able to complete it