By the Late Romantic period music had become so bad and so long that it was decided it was no longer to be left in the hands of people (prone to emotional outburst roughly akin to public masturbation), and the responsibility was to be passed to maths. This was because numbers don’t have feelings and are less likely to harbor delusions of grandeur.
"I just heard Gurre-Lieder, What the f*ck was that? That's a year of my life I'll never see again. Perhaps serialism will be shorter and make more sence"