I'm sure I've seen threads questioning the musicality of all of those.
I do think however that classical music (encompassing baroque, romantic, modern, even some post-modern, I suppose) has different reasons behind its creation. Namely the composers have an assumption as they are writing music that there is something to be found or discovered with sound. If this were not the case people wouldn't have flown off on such wild tangents as atonality. We are realizing today, I think even in academic circles (though less so) that what we discover in music is not like science but has much more to do with the individuality of say an author. Yet there remains an infinite number of things to be said even with familiar sounding harmony.
For the more conservative examples of classical composers today, even those who would consider themselves universalist but who have at least some conservative viewpoint in their aesthetic, these composers not only feel there is something new to be discovered but believe that Beauty is a real thing and not an entirely arbitrary, irrational response.
It is these things which separate classical music from most modern popular music.
It is of course true that unwittingly, a modern popular artist might be searching for something beautiful and might succeed,
but the rest of the time, they are indeed writhing lewdly around, rapping about hoes, bitches, and killing cops, doing drugs, and a whole host of other horrifying things.
That doesn't make their art NOT music, it simply makes it vulgar. It seems to me any self respecting human being should prefer music which does not glorify vulgarity, sin, or violence.
There is of course a bit of subjectivity there---instrumental boogie woogie could be construed to some to have "vulgar" rhythm in it, and since the genre was invented in bars the association would seem reasonable to parents of children growing up in the era of boogie. However since it is instrumental there is no objective reason to make these associations, and boogie woogie merely becomes a life affirming, even beautiful style of music for those who enjoy listening.
A lot of melodic metal is also primarily life affirming. In the polished mainstream ones we find very little imagery or lyrics that glorify satanic things or vulgar things, or what have you. You merely have fantastical, gothic lyrics reminiscent of poe or a gothic horror novel perhaps, combined with gorgeous instrumental music.
Allow me to add, like most on this thread, I know little about rap. I actually like the pure sound of rap, but so far I have not yet heard any examples of rap which are not vulgar and which do not glorify violence. I suppose this is because they are very "honest" about their lives...but then...who said that criminals couldn't posess the virtue of honesty?