As said in my OP, Kendrick Lamar’s “To Pimp a 🦋 Butterfly” is as sophisticated musically as any music I know. The musical themes evolve and develop including a brilliant rhythmic rap and sound effects that create “deep and broad emotional and intellectual content”.
I listened to it. I don't hear it. Ignoring the questionable lyrics ...
Wesley's Theory - Sounds like early 70's funk with some simplistic EDM synthesizer added.
King Kunta - More 70's funk. Very repetitive four-chord bass-dominant rhythm. The beat sounds like something from the disco era.
Institutionalized - Fake drums really obvious on this one. Almost no changes on the drum rhythm through the whole song. Very simple keyboards with strange, but not interesting time signature that doesn't fit the rhythm.
These Walls - Here we go with the obvious repetitive fake drums again. The female vocals sound extremely familiar. Expose (the group) maybe? Something from early 80's. Upbeat rhythm is good. Guitar line is extremely familiar too. This song is heavily influenced from something I've heard decades ago, but I can't place the exact song.
u - Decent sax. Repetitive lyrics are irritating. Bass line drags. Weird rap voicing halfway through.
Alright - This is the third song where the sax sounds like a continuation. Again, it's buried in the background. Irritating repetitive lyrics again. Backing chorus adds the flavor this song needs.
For Sale? - Very nice chorus. First song with a more complex bass line. Nice texture added by the synth.
That's enough. Compared to other rap I can see the complexity, but that isn't saying much. There is no technical mastery, except the sax, but technical mastery isn't always needed to make a great song. I don't see compositional complexity either, except for maybe the sax lines and maybe a few of the harmonies.
If we're talking Julliard-approved here and it's considered compositionally complex rap let's compare it to something like 40-year-old Rush - Xanadu. I won't even touch on the technical differences.
I think it's too hard to ask those of us who are used to something like Rush to take a step back and appreciate Lamar. I can appreciate simpler music, but it must be virtuosic, either in technical ability or in composition. But there isn't a bass line on that album I couldn't master in 5 minutes. And I'm not that good. So I just don't see it.