What are some sad Ost anime songs?

[FadeToBlackXIII]

I'm looking for piano songs that are really sad, ost from any animes

 

[Alice]

Clannad
Gundam Seed
Full Metal Alchemist Brotherhood
Naruto Shippuden
Death Note

I think every anime ost has sad numbers on it but these are a few of my favourites.

 

[Shalma]

Informative book update