Let's see quite a few already covered. I'll throw in a few:
Die Walküre - Wagner
Egmont, Op. 84_ Overture In F Minor - Ludwig Van Beethoven
Symphony No. 3 In E-Flat Major, Op. 55, ''Eroica'': II. Marcia Funébre: Adagio Assai - Ludwig Van Beethoven
Sonata No. 14 in C-Sharp Minor for Piano, Op. 27:2, "Moonlight Sonata": Adagio sostenuto - Ludwig Van Beethoven
Romeo And Juliet, Suite No. 2, Op. 64c: Montagues And Capulets - Prokofiev
Danse Macabre, Op. 40 - Camille Saint-Saëns
Fantasy For Orchestra, ''A Night On The Bare Mountain'' - Modest Mussorgsky
Symphony No. 3 For Soprano And Orchestra, ''Symphony Of Sorrowful Songs'' : I. Lento - Sostenuto Tranquillo Ma Cantabile - Henryk Górecki
Peer Gynt Suite No. 1, Op. 46: In The Hall Of The Mountain King - Edvard Grieg
Symphony No. 40 In G Minor, K. 550: Allegro Molto - Wolfgang Amadeus Mozart
Carmina Burana (Cantiones Profanae), Fortuna Imperatrix - Carl Orff
Cavalleria rusticana: Symphonic Intermezzo - Pietro Mascagni
Messa da Requiem: Dies irae - Tuba mirum - Giuseppe Verdi