Threnody to the Victims of Hiroshima
A warning to those who experience frisson or have high empathy experiences when listening to music - this is uncomfortable. There is a beauty to it, one that is drawn from the very dissonance and frenetic energy in it, but it's a piece that is meant to make you grapple with discomfort.
I had not heard this one before, though I have looked into atonal music one time in the past. This is certainly the most unsettling piece I have ever heard and it is amazing. Thank you for sharing the link.
Let me prefix this by mentioning that I only have minimal experience with the genre.
I think Livre Troisième from Les chants du hasard could qualify as unsettling/disturbing. Also check out their newest album, which goes into a more black metal direction, if you are into that.
The other one that comes to mind is The Umbersun from Elend
I had this discussion with a class the other day. It doesn't answer your question really, but the Requiem for a Dream soundtrack is rather unsettling if you've seen the film.
Can confirm, it's very emotional.
So many cool suggestions in the comments, I have to add a mention of Ennio Morrricone's soundtrack to "The Thing".
On a personal note, Shnitke's Concerto Grosso #1 always sounded like a manic bad dream to me.
Nick Cave - Tell Me What That Is from the Wind River soundtrack. It’s more sad and unsettling once you know the context and what happens in the film.
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