Decorum n. : Propriety of manner or conduct; grace arising from suitableness of speech and behavior to one's own character, or to the place and occasion; decency of conduct; seemliness; that which is seemly or suitable.

Example:
What are examples of good and bad choir Decorum? Where can I find evidence to back this up?

Taxonomy
decorum, Horace, On the Art of Poetry, free encyclopedia, classical rhetoric, theater, Aristotle, styles, stylistic, delegates, social behavior, theory, appropriateness, comic, manners, latin version, middle style, vocabulary.

Defination from the web:
... In Renaissance Italy, important debates on decorum in theater were set off by Sperone Speroni's play Canace (portraying incest between a brother ...