i would strongly agree here, i listen to podcasts from an old radio show from the Bay Area and it was quite common for MC's to do their thing over instrumentals, some of it was also doing shout outs to people calling in saying shit like "yo my name is so n so, this set is killah, keep it up", next minute the MC is be told "Yo this guy just called in saying this is killah, give him a shout out" when it comes to live sets its another ball game altogether