I don't understand where the correlation that art has to be complicated comes from, for there is plenty of art music that tend to be rather plain or simple in their construction. Of course, it depends on your timing of things.
In the 20th century of classical music simplicity tends to heighten in the 1st and 3rd turnings while complexity reigns in the 2nd and 4th turnings. The beginnings of the strict yet simple Atonal movement from a 3rd turning that transforms into the Serialism of the 4th turning onwards which saw the rise of Neo-classical Modernism that carried into the 1st turning. Cageian experimental music and its associates went into full bloom during the 2nd turning which later engendered Minimalism to come into force during the 3rd turning, only to be further complicated into Post-Minimalism.
As for popular music, that is something I'm not too keen on, and tend to listen to based on a "which one sounds good to me" basis. In fact, I'm more a fan of the pop sound of the 1960s. I also am one of the few Millennials who find nothing interesting about classic rock, which makes for much difficulty connecting to others my age in music appreciation.
Right-Wing liberal, slow progressive, and other contradictions straddling both the past and future, but out of touch with the present . . .
"We also know there are known unknowns.
That is to say, we know there are some things we do not know." - Donald Rumsfeld