[Callers] Duties of the Caller Role

Callers fill one of many roles required for conducting a successful contra dance and building a dance community (along with dance organizers, musicians, dancers, etc.) and therefore have their own unique set of responsibilities to fill that role. If you accept this view, what would the unique duties/responsibilities of a caller be? Some possible caller responsibilities: - Responsible for preparing and selecting dances to match the dancers and enhance their enjoyment of the event - Responsible for coordinating with the musicians to match tunes and dance selections - Responsible for managing the dance program timing to meet organizers' schedule - ? What do you think? -Don