/mu/sician here. i see these threads occasionally but never thought anything of them. it seems people are concerned that the rock they love is claimed by black culture or something, is that the problem?
trying to be brief here: the distorted electric guitar, as a musical element, was discovered by several different people independently as a result of overdriving amps. this was inevitable as it was a simple consequence of how they're made – or the fact that they werent built well and would break easily, offering new timbres. history will cite a few of the better-known musicians who used this early, but it's a guarantee that plenty of other people discovered it and were using it sooner, just not to large audiences. after all, the reason it sounds good is because of the even-order and odd-order harmonics that are generated by the distortion; it simply sounds good to human ears, regardless of cultural trends.
this and much more was anticipated in Luigi Russolo's manifesto, The Art of Noises (1913), and he did his best to realize what it would sound like with the (non-)technology of the age.
which leads to the next point: a genre is really defined by what motifs it contains, and this so often is nothing more than a result of people using what they have available to them. maybe always? (hiphop really took off due to the availability of samplers, for example, because that was all people had or could figure out how to use.) literally any motif in any genre, however "defining", was done earlier by a thousand other people. any that was NOT only wasnt because the means were not technologically available, and even then, you can bet it was imagined, attempted, or simulated in some way or another, even if that meant playing a lute inside a cave, or playing along to a bird's song as if it were a rhythmic element.
furthermore, rock's trio or four-piece format – bass (usually bass guitar), vocalist, drummer, guitarist – is just a simplification of the orchestra: bass frequencies to fill out the low end, drums for the rhythm and highend treble, guitarist and vocalist for the midrange. again, this is what was available, this is the best that people could do, so they took what they had and added some personalization or creativity to get something desirable so that it didnt simply sound like a second-rate orchestra.
sorry if im explaining things that everybody knows, and i dont know what the fear is about rock and niggerization or whatever, but feel free to fill me in. im guessing people out there try to claim that rock was invented by blacks and stolen by whites in a we-wuz-kangz approach? doesnt even make sense logically, so just tell them that all music is aleatory anyway, there arent that many different possible combinations of elements, and only the lyrics provide enough room for true individuality.
or just tell them that rappers stole from classical poets.