There was a paper I read some years ago about a music student analyzing modern trance music, how it relates to ancient tribal music, and how both relate to the brain. It also explained the mechanism behind the "drop", how the drop is caused by the brain anticipating it and then getting a reward for a good prediction, just like you feel nice when you can predict a twist in a movie or an ad.

What I am saying is that I think that what makes 4/4 so prevalent today is that it is somehow deeply connected to how our brains work, and if you consider popular music subject to Darwinian pressures, it is likely that 4/4 is the most "evolved" one (from a fitness view).

Anyway, I think that in 10 years we will be passing all of our music through a deep neural network, and then ask the network to create new things, like invent a new number one hit, cultural style, or create a new work in the style of Beethoven.

Disco is not dead in a pop context? Discos are full. 4/4 Beat is the norm. Ass shaking is standard. It's everywhere. The essence of disco and ass shaking is the essence of pop. Add sonified marriage/breakup proposals to it and then you got all pop in a basket.

Hiphop is not the driving force anymore, also it did not care about harmony at all in a special way. Hiphops focus has always been on rythm. The essence of hiphop is the political rap combined with sampling (pirate citations of all kind creatively layered together). Hiphop (especially rap) has been culturally annihilated.

Disco isn't just 4/4... it's a particular 16th note hi-hat groove, conventions around the use of string synths, etc. It's a stylistic period piece, and the underlying rhythms aren't widely heard these days.

I don't know why you think hip hop has been "culturally annihilated". I hear it as an incredibly dynamic and forward-looking genre.

   it's a particular 16th note

Every pop music genre has a signature sound. This is acoustic branding. It's vital for pop-music to function that the audience can determine in a fraction of a second what brand is being offered. Nothing deep going on.

   I hear it as an incredibly dynamic 
   and forward-looking genre.

What dynamic and forward-looking about 3 decades of "where da hoes at where da bitches at"?

Yes, that 70's disco sound. That's gone; Like a snake 'Disco' has shed its skin. My point is that the essence of disco is pretty much alive. Take that to the contrast that the innovative essence of hiphop is resampling - that's pretty dead. Can you name any currently successful hip hop band that does radical resampling over all genres? It's not possible because of music industry lobbying.

> Take that to the contrast that the innovative essence of hiphop is resampling

Resampling isn't particularly innovative as Im sure you aware of musique concrete and tape music. Hip-hop is essentially defined by the combination of rapping, sociopolitical subtexts, and, yes, specific music production techniques that include sampling but also certain types of rhythms and beats. Those are roughly in order of importance; notice how few people openly lament the death of sampling but the prominence of a white rapper will prompt endless critical and popular commentary.

> that's pretty dead.

Anyone who can listen to To Pimp a Butterfly and believe that hip hop is dead does not know what hip hop is.

> Can you name any currently successful hip hop band that does radical resampling over all genres?

When has this been the criterion for what makes a hip hop band?

House music is 'just' disco played on an 808. Or that's how it started anyway.

   As a cultural innovation, trap music is cool.

In what sense? It's same old same old "Where da hoes at where da bitches at" soft-porn junk that the distraction industry has been selling to teenagers for about 3 decades.