Maybe kind of like mini-hives? So say you're assigned to a specific class, all of the ones in that class will recognize you and might even know a little bit about you-- nothing personal, but things like if you usually show up late or if you like math or history better. Really really general things. If you go to another class they probably won't have any idea who you are beyond a last name since all of our names are in the school's rosters. If you play decent music against the rules, most of the teenagers will be attracted to it and most of the adults will try to apprehend you for it. It's consistent. They're able to differentiate between good and bad music though, so they can tell if something is actually good or not. If it wasn't an accurate response, they wouldn't be fulfilling their purpose.