Fast forward: modernism

In modernism, realism is merely a category under naturalism, as our thought and view gradually process, we came to the term 'new is always better'

We are on the progress of ditching the old belief and move on to the new era, although we are only on the entrance of the new era. However, as usual, Friedrich Nietzsche:

"no artist tolerates reality!"

Well, haters gonna hate, but here is a journal on his arguments against realism.

Another term that we can look into is Atonalism:

  in its broadest sense describes music that lacks a tonal center, or key. Atonality in this sense usually describes compositions written from about 1908 to the present day where a hierarchy of pitches focusing on a single, central tone is not used, and the notes of the chromatic scale function independently of one another (Kennedy 1994). More narrowly, the term describes music that does not conform to the system of tonal hierarchies that characterized classical European music between the seventeenth and nineteenth centuries (Lansky, Perle, and Headlam 2001).

(Wikipedia)