The main idea of the text is that the lady was not a good singer. We have to respect the people who work for us. If she invited the singer to a dinner party, she should put him in the living room with the guests. I think the singer gave a good lesson for a rich lady.
A main idea of text is in that a lady was not valid to the singer. We must respect people that work for us. If she invited a singer on a dinner-party, she was necessary to plant him in pond state scum with guests. I think that a singer gave a good lesson for a rich lady.