Sibelius: The Death of Melisande (Title says it all)
Strauss: I'm Abendrot (Literally 'sunset')
Elgar: The Intermezzo from his Crown of India suite. (Very tender)
Schubert: Die Leierman. (Soul crushing)
Mahler: Adagietto. (Used in films such as Death in Venice)
Beethoven: The Funeral March from his 3rd Symphony. (It is long but will leave you moved)
Piazzolla: Soledad. (Solitude)
Ravel: Pavane for a Dead Princess