There's certainly precedents in terms of black political poetry in music (The Last Poets, Gil Scott-Heron) and there was clearly a need for the disenfranchised

There's certainly precedents in terms of black political poetry in music (The Last Poets, Gil Scott-Heron) and there was clearly a need for the disenfranchised to have a voice, but there's the other aspects such as graffiti, dancing and DJing that all came together over time.