What is a theatrical form?;

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this isn't a question but, for those who are wondering what is it, I did a research and here are the information I found:
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• There are four basic theatrical forms either defined, implied, or derived by or from Aristotle: Tragedy; Comedy; Melodrama; and Drama ,Theatrical styles are influenced by their time and place, artistic and other social structures, as well as the individual style of the particular artist or artists.
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