Death Of Cedric ; link
Possession ; link
A Window To The Past ; link
Godric's Hollow Graveyard ; link
Harry and Hermione ; link
Leaving Hogwarts ; link
Dumbledore's Farewell ; link
Courtyard Apocalypse ; link
Obliviate ; link
A New Beginning ; link
Farewell To Dobby ; link
Lily's Theme ; link
In Noctem ; link
The Friends ; link
Severus and Lily ; link

Death of a fellow Hufflepuff? Seems sad enough.

Death of Cedric: OMG, I'm crying!!
Possession: Meh..
A Window to the Past: Relaxing, not really sad.
Godric's Hollow Graveyard: IDK...
Harry and Hermione:
Leaving Hogwarts: The song brings a sense of joy.
Dumbledore's Farewell: The beginning... meh; the middle... sad.
Courtyard Apocalypse: My favorite, but not sad.
Lily's theme: Sad, sad, sad!
And the others I felt nothing or the songs were blocked in my country and I didn't feel like looking them up. xD

Of course, Cedric is awesome and when he died it just broke my heart. The song made it even more unbearable.

This then Dumbledore's Farewell sob both are two beautiful pieces of music

And Death of Cedric. Both videos were so sad.