The document discusses the origins and history of hip hop and rap music. It describes how hip hop arose in the 1970s in New York City from DJs at block parties who would isolate and loop percussion breaks from funk and soul songs. This sampling and remixing of music evolved from earlier Jamaican dub styles. The document also explains that rapping is a vocal style involving rhythmic spoken word and rhyme that is often performed over hip hop beats. Key figures mentioned include DJ Kool Herc and rapper Snoop Dogg.