What is the reason rap COMPLETELY took over rock. Not just in 1990 but 2010.

[Racky]

This is reasonable, but I think it's missing the bigger picture. When I talk about the culture of rap, I'm not talking just about the listeners, but the rappers themselves. What inspires them to make songs? Do they spend a few years making an epic statement piece, or do they hammer out a few minutes at the end of the week, as soon as they get a chance to visit the studio?

Different ones have different attitudes regarding their craft
Some just freestyle / punch-in for a few minutes at the end of the week "as soon as they get a chance to visit the studio", absolutely.
Some spend more time on their craft though they might not admit it. I remember reading an interview where one talked about spending almost a year on a single song. Tried to find it but couldn't, I don't remember who it was I think it was Lupe Fiasco or something.
Though, with anything that is popular and especially in the current market influenced by the internet and streaming, the first attitude is more common because it's more profitable

I know what you mean. You mean pitched percussion.

Most drums are have pitch.
If you take a drumset the bass drum will have a lower pitch than the timbales.
Even taking a single conga different strokes produce different pitches.
The thing is that when the focus isn't on pitch and they are only there for the "rhythm section", as it's usually the case in most music, they do not have definite pitch and thus aren't tuned. Doesn't mean they couldn't be used that way. That does not describe the instrument itself but the direction in which it is usually taken.

Now with tuned drums that have definite pitch you have drum-chimes, which is what I posted in the vocaroo. It's an ensemble for 15 tuned drums, usually pieces that are also played on the xylophone at very fast BPM. Don't tell me "chimes aren't drums" or that I'm mixing up "category (percussion) and particular thing (drums)". Those are drums

Among those people, or the Igbo who also had something similar with ukom drums, drums wouldn't be classified as "unpitched percussion" since they use them like that. You are using descriptive(not prescriptive) terms that evolved in Western music to describe how things are used in it, but those terms don't describe the scope in which such tools can be used. There is a distinction.

This is a bias that fans of rap have towards other forms of music. There's no such thing as music without rhythm.This whole "it doesn't have rhythm" is an ignorant cliche among rap fans. That is exactly the kind of ignorant statement that rap culture gives rise to.

You could argue with theory that some music with no fixed beat or pulse does have some sort of discreet or abstract "rhythm" but that's just descriptive theory and the main point here is that clearly those artists do not have rhythm as a focus. They purposely de-emphasize rhythm to focus on atmosphere.

Since you like muh ensembles

They might talk about the lyrics, but lyrics aren't music.

They don't use music theory because the genre exists and emerged completely outside of academia, but they understand musical concepts and do talk about them in intuitive terms like "flow", amount of syllables per beat, rhyme patterns, "chopped", etc.... When talking about lyrics in rap you are always talking about music as the lyrics in themselves don't matter, but how they are delivered on the beat does.

They can't really talk about the music analytically because there's nothing to say. If they're actually talking about the music, what are they gonna say?

They do in the terms I described earlier, but if you want to know how it could be done using theory check out this blog :

Rap Music Analysis #3 – Is Nas The Best Technical Rapper Ever…By Far?

After last month’s article on Kendrick Lamar, found here, let’s take a look at a different rapper for this next rap music analysis. This time we’ll be looking at Nas’ 2nd (and only) verse on …

www.rapanalysis.com

A lot of articles there + sheets. There are also papers by other people you can find if you look for them.
It's totally possible to use muh music theory to talk about rap analytically, people just don't do it because it's not part of the culture or history of the genre. Does not make it less though, theory is just descriptive. People understand and can talk about "syncopation" by hearing or performing it without having to read the term in a music theory book.