A common misconception with a lot of rap music is that it is all the same. Just a repeated beat, ad nauseum, with some people rapping over it. I have found, that, especially in modern rap music, there is more variation than most main stream rock. When I hear a rock song these days, it's always very very generic. So much so, that I can usually guess the chord progressions and be correct upon the first time hearing it. The lyrics are even worse, sparse thoughtless lyrics that mean nothing till the chorus which repeats many times. But with much rap music these days, the production of the breaks is at a point where, while the actual drum track, might remain the same, the other things going on in hte break are constantly changing, flowing with the rappers, and moving with the progression of hte song. yet still, rap music is always percieved as having little or no variation when it comes to the musical aspect. this is certinaly the case for some old-school styled free-stylers, a lot of simple underground stuff, like gang-starr, doesn't have much variation, but then there are a lot of newer fresh acts, like J5, Blackalicous, Hieroglyphics, aesop rock...and the list goes on and on. even in the mainstream world. I was listenin to some BS, I don't even remember who it was, but the break was happening, it was interesting, dynamic, and way more complex than the rest of hte stuff that was played afterwards. I wish people could reconsider what they are saying when they diss rap. It is as valid a form of music as anything else, and it shouldn't be dismayed so much.