Interesting. I think there is a relationship to expectations/predictability but we also enjoy subversion of those expectations like syncopation in a second verse or bridges, etc.

> and it gets rewarded when it correctly predicts stuff.

Yet it's way more fun if the music evolves and takes twists you don't expected. I actually get quite aggressive from to predictable music, basically most modern pop music, but I guess that's highly subjective. For me good music must be intellectual exhaustive.

And then there is whatever copulation the Jazz players are doing with their saxophones.

Hmm. I wonder if that can say anything about an individual's brain. That is, what type if people like the rhythmicity?