Once that is established, as per the linked article, 12-tone equal temperament makes a lot of sense (but isn’t universal, obviously) because it’s resulting tuning gives us a really close 3/2 and 4/3, and having a simple 12-tone scale reasonably in tune everyone can agree on makes sense.
We can then explain that 5/4 and 6/5 are a bit off in 12-tone, but are “good enough” that we tolerate them being slightly out of tune when using equal temperament. Once we accept that 12-tone has imperfect thirds, we can then look at the I IV V chord progression (I IV V comes from 3/2, 5/4, and 4/3 sounding pleasant to the human ear), and explain why that chord progression is so common in western popular music.
These aren’t universal truths—12-tone equal temperament is a compromise, but, as per the linked article, a reasonable one. Just intonation is, of course, another possible compromise.
[1] 2/1: Octave; 3/2: Perfect fifth; 4/3: Perfect fourth; 5/4: Major third; 6/5: Minor third
And in many cases we don't need to tolerate this because most instruments barring guitar and piano allow musicians to tune chords to just temperament, and players will do this automatically and completely subconsciously.
The linked article makes the case for equal temperament by showing that 12 just fifths played in sequence is flat compared to seven octaves.
Attributing it's hit status to the perfect intervals is ignoring all of the other choices (and supporting infrastructure) that go into making a hit. It's like saying that the Dodge Charger was a successful car because the windshield wipers are of a certain make.
Side note: It may very well be a sampled trumpet.
“"Safe and Sound's" trumpet line is partly responsible for the popularity Capital Cities is currently enjoying”
>>>The trumpet line in ‘Safe and Sound’, for example, didn’t appear in the production until nine versions into the song. The final version, on a whim, we decided to try using a trumpet, a live trumpet, to play that line and it stuck. We ended up actually using the trumpet a lot throughout the album after we included it in ‘Safe and Sound’.
"It was trial and error, right? We felt like that line was an epic line and we thought about different instruments that sounded epic, and the trumpet is obviously one of them,<<<
The thing about trumpets is this: Their fifth is a little “sharp” because it’s a perfect just intonated fifth (i.e. a perfect 3/2 ratio).
What is or isn't pleasurable is a matter of cultural training, and treating them as absolute facts is what I found frustrating in the books that I was complaining about.
I am not an expert, so maybe this book has its own shortcomings which I am being blind to. But this is the first book on music I have been able to read this far without having to fight the urge to fling it against a wall.
[1] https://mitpress.mit.edu/9780262692373/music-and-memory/