There are several uploads of the music from this game on this site (granted none of the links work anymore save two of them...), including one that even specifically aims to include the tracks missing from the official CD's, but still, I have not been able to find the one song from the game that I most wanted to begin with: the one that the three robot musicians in the game are playing after you've helped them repair their instruments. That song is so awesome. Does anyone know if it can be found anywhere?

Just in case you haven't found the track yet

It's available for free from the website of the composer
Machinarium Soundtrack Bonus EP (Free DWNLD) | Floex (http://store.floex.cz/album/machinarium-soundtrack-bonus-ep-free-dwnld)

You can even choose between mp3 and lossless formats