Why shouldn't rap be esoteric, able to take in current events, history and criticism? I guess it's this old idea of containment - that rappers, because they're black, can't and shouldn't aspire to look outside the ghetto for influence.
I think it was just an opera. Now, you go to opera, you expect to see and hear what the opera is. So, it was Catfish Row. It was singers. Marvelous voices. It didn't make no difference what color they were.