Gankogui is the name of this double bell or gong. It is constructed from iron. In Ewe music in general, and during Atsiã in particular, gankogui keeps the time. Gankogui is vital to any performance as it serves as a common reference point for everyone in the group - drummers as well as dancers and singers. The person playing gankogui must have excellent time and not be distracted easily. The rhythm that gankogui plays during Atsiã is notated below. Please note that this rhythm is not unique to Atsia. It is common not only in Ewe music but throughout Africa. Therefore this rhythm by itself is not an accurate way to distinguish this piece.