The group above isn’t identified and the photo has faded quite a bit. The only information on the cabinet card is the name and address of the Chicago studio of William L. Koehne (1869-1965) and Charles F. Bretzman (1867-1934). The partnership between the two photographers began by 1894 and ended in 1899 or very early the following year. In February 1900 Bretzman moved to Indianapolis, Indiana. We can therefore date the photo to the period 1894-1900.
The members of the group look very close in age, which makes me think they might have been a college drama club. On the other hand, the women are wearing folk costumes, so they might have been folk singers or dancers. Maybe they were touring the country and stopped to perform in Chicago. Do their outfits tell you anything? One woman is wearing a striped skirt which must have been very colorful.