Sorry, but I'm not certain why:
Why did Xenakis compose music that 'hurt' listeners? 'closed as off-topic'?
Is Xenakis's dissonant music intended to express his personal sufferings and torments? 'closed as primarily opinion-based'?
How does ignoring the math behind Xenakis's cacophonously dissonant music, affect your reaction to it? 'closed as primarily opinion-based' ?
These involve music composition, history, and theory that are covered by the on-topic criteria:
Music: Practice & Theory Stack Exchange is for musicians, students, and enthusiasts. If you have a question about... [...]
practice or performance technique
music theory, notation, history, or compositionIs the hitch my writing? How can I improve?