A lot of valid points, but I disagree in some areas.
Hip-hop is not 'non-harmonic'. Hip-hop utilizes harmony, but tends to utilize static harmony or basic harmony, which is not different from a lot of popular music.
Popular music has been groove based for a long time. You can thank black artists like James Brown and jazz for that. Pop been about groove for a while.
Pop utilizes verse-chorus as well in a manner not dissimilar to hip-hop. The difference between the two genres in terms of 'structure' is actually not that significant.
'Integrated instrumentation' vs 'non-interacting layers'...can you elaborate on that?
Musically the biggest difference occurs in terms of rhythm, which is due to the heavy usage of syncopation and triplets. But that is nothing unique to hip hop. That comes from jazz (which is heavy on syncopation) which extends down to funk and has been incorporated in popular music. The rhythmic devices used in funk are more prevalent in hip-hop, and have also been used in popular music. Rhythm has now become just as important in popular music since it is a primary element in black music, and we all know the history of how much popular music "borrows" from black music.
Because these two genres have "borrowed" from the same sources, the musical elements themselves are not really dissimilar. I think the primary differences between the genres lie mostly in timbre and instrumentation. Two of the greatest things that hip hop culture introduced to the world are sampling and rapping. As well as eschewing melody (at least for vocalists, although a lot of hip-hop still incorporates melody in some shape or form).
Interesting. It's hard to deduce both genres down to these generic explanations.
Ehhhh I don't know if its really beneficial to split hairs too much... but a few of these things just cant stand...
Hip Hop is not generally a harmonic music... harmony has a specific definition, hip hop may have harmonic elements depending on what it samples... but by the same token probably the majority of hip hop songs do not have any harmonic elements other than a chord stab... there is no interplay between multiple voices (vocal or instrumental), there is not a vertical organization of notes from a major or minor scale used to back and give structure to the melody... because there is no melody... there can be depending on what is music is sampled but its not intrinsic to the artform... for instance... public enemy, marley marl, bdp... almost never had any harmonies going on... where as in pop music it is extremely rare for a song to be constructed without harmony...
Groove is a subjective term... pop has for the longest had dance and rhythmic drivers... but it is not groove based... meaning many perhaps the majority of hip hop songs are based around a short repeated rhythmic figure to the exclusion of all else... this rarely is the case with pop music its certainly an exception to the rule when it happens...
look at it this way pop music is all about using standard musical transitions to establish tension and release, hook you into the song then provide a climax... hip hop is all about a sustained rhythmic figure to induce a consistent trancelike zone...