It appears that the present-day form of African American English is not the inheritance of the period of slavery, but the creation of the second half of the 20th century.
“The thing that makes you exceptional, if you are at all, is inevitably that which must also make you lonely.”
“But when you get to a song, not only do you have to do a vocal melody, you have to write words and not be redundant and make some semblance of a story.”