Most unique music you know of

[MRubey]

What doesn’t sound like anything else?

I offer side 3 of Tales From Topographic Oceans, The Ancient (Giants under the Sun)

absolutely unique

 

[MRubey]

In the symphonic realm, from my limited knowledge….
Schoenberg’s violin concerto. I have the Hahn version.
it is very challenging. Almost nothing repeats. Constant change.
It’s like a disturbing dream you can’t wake from.