Do they have songs which they didn't release in their albums?

i disappear was a single that wasnt on any album

also...
no leaf clover
-human
i know those songs are on the s&m album, but they weren't actually recorded for an official studio album.

death is not the end
this was replaced by, "the end of the line" on death magnetic. although they have the same intro, it's a completely different song :).
♥