By the way, with regard to compulsory smoking for pianists, this is not always the case. Although you are right in the fact that different performers are customary to dress on the stage differently - also an obscure dress code: the pianists and vocalists, for example, dresses are different in style - etc. That only confirms the thought of the rules and appropriateness.
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This is for artists! Not for the audience. The audience should be quiet, not beautiful. And not applause between parts of the same work. That’s respect, not that they’re all dressed like that.