to play at all the block parties to, slowly but surely, hip-hop taking over. >> the music underneath rapping is called scratching. and it's a process of using two turn tables and a mixer, making new sounds out of already-existing albums. >> thing that gave life to music in the '80s, for me, was hip-hop. because it took the sounds of the '60s and '70s and brought it to the forefront. ♪ >> the message was the first hip-hop song that wasn't just a party song. it was talking about what was going on. it was talking about urban decay. it was talking about drugs, crime, prison. all of these things that were hitting these communities really hard. >> when a message hit, man, it was, okay, put that down. wha