You dont give much option or show much appeal when you talk about either of the genres. rock itself is hard to explain, because almost any genre that involves a guitar, bass and drums falls under "rock". It is more of a category than anything, and korn? puddle of mudd? are you kidding me? does anyone have a unique taste in music here or do you all listen to the same shit.
Also, i dont know what you consider rap, but i do enjoy some hip hop, nujabes, pase rock, lupe fiasco, wu-tang clan, good stuff like that.