James Brown is a fuckin' genius. He is. He really is. A lot of people won't understand this, but he has had a lot of influence on Hip Hop music and the Hip Hop culture as a whole. This shit is so real I really don't know how to emphasize it any stronger.
Now, don't get it twisted. This "bling-bling/I Got More Shit Than You/Bust A Cap In Yo Ass" shit that you see on MTV and hear on the radio? Not directly influenced by "The Godfather of Soul". But James influenced many of the dancers and DJ's in the late 60's and early 70's in a huge way. His lyrics were fierce (when intelligible). His beats were way ahead of his time. His dancing was at a level never seen before. James Brown was Hip Hop before Hip Hop was Hip Hop.
Songs like "Give It Up, Turn It Loose", "Superbad", and "Sex-Machine" were b-boy anthems in the 70's and remain so even today. His dancing style influenced many urban youth and was incorporated into the dancing of the 70's, which in turn was amalgamated into the footwork and top rock of b-boying (breakdancing).
Now, I know a lot of you are thinking about how b-boying is related to Hip Hop at all. Well, Hip Hop is known and defined by it's basic four elements: B-boying (breakdancing), Emceeing (Rap), Graffiti Art, and DJ (Turntablism). The Zulu Nation has recently identified 5 other elements of the culture which includes Beatboxing, Street Language(Slang), Street Fashion, Street Entrepeneurialism, and Street Knowledge. There is more to Hip Hop than the music. In the immortal words of KRS-1, "Rap is something you do, Hip Hop is something you live.". Feel that.
The roots of Hip Hop have been traced back around the early 70's in the South Bronx of NYC. Hip Hop was never really known nationally until the explosion of the popularity of b-boying, or what the national media labeled as "Breakdacing". Breakdancing became hugely popular with the release of the film "Flashdance" in 1983, which for the first time Hip Hop was shown to the world by members of the Rock Steady Crew, whom had parts in the movie. It was b-boying that brought Hip Hop to the forefront for the very first time. It was b-boying that exposed the rest of the world to what would eventually become a billion dollar industry.
So that's the lineage. James Brown had a huge influence on the dance and music of the 70's, which in turn directly influenced b-boying and eventually Hip Hop as a whole. But even aside from the music, James Brown had an aura. His attitude and the way he carried himself had a huge influence on the raw and uncut mentality of Hip Hop artists, both dancers and musicians alike.