I thought I had posted about this song before, perhaps on Facebook, but cannot find the link. So let me add it here with a ‘music’ tag for future reference.
Which is to say, my past year’s favorite song: Frank Ocean, Pyramids. An epic, two-part song about black women and history.
Rapgenius has an informative exegesis, in the right sidebar.
[Corrected YouTube link 11apr14; this is the full song, though without a video.]