Afro Blue is the second track on Robert Glasper’s grammy-winning album “Black Radio” (February ‘12).
The track follows the concept of including R&B and Rap artists by featuring Erykah Badu on lead vocals.

Afro Blue was originally written by Mongo Santamaria and is listed as a jazz standard.
https://www.youtube.com/watch?v=YbE7jf_Hp5w
Glasper’s version differs from most other ones by changing the time signature from the usual 12/8 or 6/8 beat into a hip-hop influenced 4/4 beat.
https://www.youtube.com/watch?v=uzdn_qZUHxE