Coming up in the 9:00 hour, we’ll hear Adolphus Hailstork’s cantata, “Done Made My Vow,” on texts steeped in African American history and the writings and speeches of figures such as Frederick Douglass and Martin Luther King, Jr.

Then at 10:00, Clipper Erickson, piano of Westminster Conservatory of Music will drop by to talk a bit about R. Nathaniel Dett, the grandson of fugitive slaves, who went on to become an important voice in American music. We’ll sample from Erickson’s album of Dett’s complete piano works, “My Cup Runneth Over,” recently issued on the Navona Records label.

On the eve of MLK’s birthday, it’s all music by composers of African descent until 11 ET, on WPRB 103.3 FM and at wprb.com.

PHOTOS: All hail Hailstork (left), with a debt to Dett