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Pitch is indicated by the position of notes on the lines and spaces on the staff
He refers to the jazz age using instruments.
Photography might be banned in many museums, and historic sites, reason being the museum or historic site is exclusive, and has an admission fee, spoiling revenue for the museum/historic site, people will be like; "Oh, I've already seen that. It looks boring.", Or it may be disrespectful, such as if you are in a historic tomb, or for example, the preserved body of Soviet leader Lenin, it can disrespect the curators of the museum, and in a spiritual way, the body itself.
