Doesn't have to be an issue about social issues to not be plain retarded in terms of linguistics. Point in case: Big L. Gangsta rap that had flow and cleverness. Lil Wayne and Rick Ross don't really cut that, but I do love that song 8 Ball by Rick Ross, he's just plain fun to listen to.
Sometimes when I'm stuck in traffic I'll say to myself, "Dead in the middle of little Italy little did we know that we riddled some middle man who didn't do diddly."
