Musicals are, by nature, theatrical, meaning poetic, meaning having to move the audience's imagination and create a suspension of disbelief, by which I mean there's no fourth wall.
The lounge of the main hotel is full of jollity, with large comfortable men sitting in braces; the bar is packed with talkative intellectuals, full of witty disloyalties. The next week the main hotel is suddenly full of dinner-jackets and large hats. The girls are dressed as if for a weekend in the country. When one of the great men of the party comes through, the crowd edges respectfully away, murmuring loyal noises.