here are some of the better known 'inhumane' pieces, all from the post-war European modernists, which I all like a lot:

https://www.youtube.com/watch?v=adfpLuk0-MY (Klavierstueck ix by Stockhausen)

https://www.youtube.com/watch?v=ceXWHdFZdqA (Pli selon pli by Boulez)

https://www.youtube.com/watch?v=JWlwCRlVh7M (Athmosphere by Ligeti)

https://www.youtube.com/watch?v=V1XSmiGO3XE (Sinfonia by Berio)

https://www.youtube.com/watch?v=SZazYFchLRI (Metastasis by Xenakis)

And a more recent work:

https://www.youtube.com/watch?v=_TKoN_HYJBg (La commedia by Andriessen)