The loose concept is using rap songs which have choruses that are pure Hip-Hop. Chorus structures which owe more to being birthed by the culture, than the influences of commercial music. That's not to say there aren't many dope rap songs with catchy as fuck hooks, but I think more about the tracks which were forced to have more traditional choruses, and ended up worse for it.
In this mix I'm celebrating the scratched hook where the DJ can get busy, the choruses where an MC just spits a few words and then lets the beat rock while taking a B-Boy stance, or the decision to have no chorus and just keeping the ill rhymes coming back to back.