Unidentified Amnesia Music Tracks

[Mudbill]

Do you own the game? All these files should be possible to find in the game folder.
In /sounds/general you will find general_piano01.ogg which is the second piano track you're looking for. The first one I believe is general_piano03.ogg. They are only small parts though, a couple of seconds each, so I don't think you'll find any "extended" versions of them.

The third one is pretty vague, but it should be in those folders somewhere.

Last one, if from a custom story, you'll have to dig in the files of that custom story. However it does sound like 27_amb.ogg from /sounds/27

Edit: I was able to find the track that plays when you wake up. It's in /sounds/03/03_waking_up.ogg