Kurtis Blow, 1986
(Did you know that that Nas/Lauren Hill song was based on Kurtis Blow’s last big single? I did not.)
Dick Clark, to his eternal credit, always took as a given the centrality of black artists and audiences to 20th-century American popular music, and Bandstand featured a fair bit of hip-hop in its last decade. (From 1985, you can see Run DMC do “Jam Master Jammin’,” no embedding sorry.)