I've played a video game Need for Speed Most Wanted, and I came across a weird trend it's it's soundtrack: there were many songs that had hip-hop/rap style, but were backed up by heavy (distorted, industrial rock) guitar chords, something we usually see in rock songs. Mind that there is no real structure of the "rock" part of the song, as there is no solo parts, and guitar almost never gets into focus, so I could be wrong when I label simple power chords as a defining characteristic of a rock song.
Songs like Nine Thou (Styles Of Beyond), I Am Rock (Rock), Skinnyman (Static-X) all have those rock elements, while generally being rap-ish.
Is such rock influence a result of the time of the making, and the culture that was dominant that time (putting rock chords may have been the trend now), or was it a completely new genre that developed on it's own?