After watching the Secret Codes of Hit-song.(SBS Special)

This video's pretty interested to me.
Because I've been studying harmonics. So i'm used to several codes by now.
Basically, there are 3 units of Music. Those are rhythm, melody, harmony.
I thought 'The Secret Codes' has related to melody.
According to video, 'E - B - Cm# - A' Codes could be popular.
Because it's familiar, stable and make beautiful sounds.
The cannon variation's very stable due to 2 flat playing.
This variation has a rule what playing besides scale.
And the hit-song distinction machine's very impressive.
Actually, I thought that's impossible. Because pop involved with trends and fashion.
But those thing's not a passive. it's dynamic things and unpredictable.
So I couldn't accept that computers can calculates for Hit-song.
However, I saw that computer in this video.
It has highly A.I.(Artificial Intelligence) performance. So that's possible.
And even it has highly performance ability, It still needs hand.
Many people work on analysis of the songs.
Although the distinction program needs hand, program nevertheless be extremely valuable.
It's also distinction pop-song well and even K-pop.
But I feel inconvenience of k-pop testing.
They tried mainly cheerful dance song. So I just wonder that even if Rap song or ballad song in korean could be analysis well? Be based on this video, it has to. But I think it'd be difficult. Because of almost of Rap song and Ballad song following Pop-song (USA). it's like a copier(cover). I didn't mean it's wrong or bad. That's correct way for make better.
But it should be get underestimation or overestimation due to copier.
Finally, I'd like to thank this video for bring back my memories about harmonics.