the piano reminds me of Kyle Gabler's track called "Jelly", which, as I know, was created not later than in 2003... (it appeared in the game World of Goo)
you can hear and download it here: http://www.lastfm.pl/music/Kyle+Gabler/_/Jelly
so check it yourself
i love how initially the guitar sounds kind of upbeat, and not all that sad. but as the song progresses and other instruments are added in, the tone quickly changes. 'sometime you go la di da di da di da until your eyes roll back into your head...'