Sorrowful/Dark Classical

[Mercy/Severity]

heavy emphasis on melencholy, sadness, sorrow etc.

please do share.

 

[Thoth-Amon]

Well you can start with:
Gorecki- Symphony 3

 

[no country for old wainds]

Schubert's Death and the Maiden, obviously. I've also got a thing for Buxtehude's Passacaglia in D minor atm.