Nagô refers to the Yoruba people, an ethnic group predominantly found in Nigeria and Benin. In Brazil, it specifically denotes the descendants of enslaved Yoruba people and their cultural contributions, particularly in music and religion.
In the context of Jorge Ben Jor's song, "Rei Nagô" (King Nagô) likely refers to a revered figure or a symbolic representation of the rich Afro-Brazilian cultural heritage, especially samba, which is deeply rooted in African traditions. The lyrics lament that since the "King Nagô" left, "Ninguém jamais fez samba, ninguém jamais cantou" (No one ever made samba, no one ever sang), highlighting the profound loss of this cultural essence.