those 3 songs are good but i wouldn't call them jazz, they're closer to the less avant garde end of contemporary composition if anything, to me they sound like Satie via Penguin Cafe Orchestra, or something, but it's not a field of music I know a much about.
If you're looking for jazz ballads with piano you can do a lot worse than checking out Bill Evans.
http://uk.youtube.com/watch?v=a2LFVW...eature=related
Or Miles Davis - Kind of Blue
http://uk.youtube.com/watch?v=DEC8nqT6Rrk
For something more contemporary and more jazzy, but still quite dark and moody you could give Chicago Underground Duo/Trio a try
Duo
http://uk.youtube.com/watch?v=lBjULbaICzA
Trio
http://uk.youtube.com/watch?v=sHjUSC...eature=related