Not if they had listened to Lucille Bogan's "Shave 'Em Dry" - recorded in 1935 and one of the best-selling blues 78s of all time.
That song is rawer than 99% of all the hip hop records I've ever heard (and I own about 600 hip hop records and I've probably heard upwards of 5,000).
Exactly the song I thought of when I read that post. These kids today think they invented everything.