Hey, Dylan's "Subterranean Homesick Blues" predates both of those.
Yes it does but not Louis Jordan's Saturday Night Fish Fry..
And incidentally, that Digable Planets track I posted above recalls Dylan's John Wesley Harding and, in particular, in terms of narrative style and vocal delivery, "Ballad of Frankie Lee and Judas Priest".
Of course you don't have hip-hop without Jamaican toasting.
No doubt. But I think the primary guy would have been James Brown-who had a great voice but is really not someone I would call a great singer..