Your own saddest songs, just post em. Youtube if you can. And it doesn't HAVE to be in D Minor.

Eric Clapton - Tears in Heaven (and hey, this is probably going to be posted a million times anyways): http://www.youtube.com/watch?v=VRsJlAJvOSM

Creedence Clearwater Revival - Have You Ever Seen The Rain?: http://www.youtube.com/watch?v=TS9_ipu9GKw

Joe Satriani - Saying Goodbye: http://www.youtube.com/watch?v=y4Xp-Zkf2QM
i have a few i'd like to share that really touches me

helpless - Neil Young

cryin - Joe Satriani

lonely day - System of a Down

thats just the 1st 3 songs that popped in my head~
Oh, Cryin'! How could I have missed that! Yeah there's a lot of others, but I didn't want to rabble on...

And I ran several different searches, but couldn't find anything right, but if it's a lock then it's a lock.
warmness on the soul - avenged sevenfold, brings a tear to my eye everytime:cry
seize the day is also fairly emotional too but, warmness on the soul just has that feel from the instruments used.
Gibson Les Paul Studio
Epiphone SG Special Customshop
Jackson JS30RR

Dunlop Crybaby Original
Boss Metal Zone
Digitech Screamin' Blues
Ibanez Lo Fi
Behringer Tuner

Marshall AVT100X

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I Use a purple pick.

Grinf**ked by Devildriver.

Seriously though, I think I Won't See You Tonight Part 1 by Avenged Sevenfold is good. Its my funeral song.
Our hearts are with Nick Grundy.
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I think AvengedThrice is pretty cool guy, eh raeps kittens to death and doesn't afraid of anything.

He knows me well..
Deep Purple:
Blind Man

Rainbow eyes

Pink Floyd:
High Hopes
Comfortably numb

Concerto Arjuenez 2nd movement Adagio
Frank Zappa's not dead. He just smells funny.
On the Madcap Laughs, somewhere in the middle Syd Barrett sings with some crappy guitar playing "Don't you miss me? Wouldn't you miss me at all?" and you can just hear his mind breaking down, it's pretty sad.
Except the EMO-songs cause those are pathetic (sorry sorry sorry... stop flaming!)
... eeehm...
Tears in Heaven
Pain of Salvation - Undertow
MIA- Avenged Sevenfold
Yesterday- The Beatles (not a huge fan of)
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You sir, are a true hero.

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Dude, seriously, you're an ass hole. That place where **** comes out, yea that's you man.
Eternal Wait and Lost in Despair by Ensiferum.

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oh yea, stanleybach, what are u like the forum ass hole, stop tryin to ruin all the fun u dick head

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Stanleybach fucked a tree. My perversion is nothing.
Something about Us by Daft Punk is pretty sad in the context of the movie it was featured in.