Sogo is the largest of the supporting drums used to play Atsiã. In some other pieces it is used as a lead drum. It is about two and a half feet tall, its head is about ten inches in diameter and it is closed at the bottom. Like kidi and kaganu, sogo plays its own rhythm during the basic pattern. Sogo is also free to play some variations and improvisations during the basic pattern. Sogo responds to the lead drummer's calls in unison with kidi. The basic rhythm for Sogo is demonstrated above.