The trick with hip-hop-hip-hop is a sport. The only music that's really, really close to a sport. It starts off, "My DJ's better than yours. I can out-rap you, I can out-dance you, my graffiti piece is better than you." It's very competitive.
Everyone who raps isn't hip-hop. To be hip-hop, you've got to know the culture. You got to know the history.
