S. Annie Frost, Frost's Laws and By-Laws of American Society
“ If dancing is introduced, the etiquette of the ball-room is also the etiquette for the evening party. It is best for the hostess to provide a pianist, if she does not herself preside at the piano, as it is excessively ill-bred to expect part of the guests to play for the remainder to dance. Many good-natured people find themselves thus victimized—invited "because they are always so willing to play for dancing." It is a good plan in a dancing party to have ices alone handed round once or even twice during the evening, and a hot supper later, if at all. ”
