Oko are side-blown horns and Akohẹn are flutes, however since the instruments look very similar they are grouped together here. Oko are frequently used by priests to evoke spirits and by traditional doctors to drive away witches when attending to a patient that may have been afflicted by a witch. Oko can also serve as an object of commemoration; when a new Ọba sends an ivory Oko to be kept at the Olokun Shrine in Ughoton, it is to commemorate his accession to the throne. Akohen, on the other hand, is a flute. Egharevba (1968:40[7]) dates the Akohen to the era of Ọba Eresoyen.