Amanita Design, you make me want to pull your virtual cheeks, you!
Amanita Design, the now fairly well-known developer of the charmingly illustrated Machinarium says just released the “Free Machinarium Bonus EP”, which is something of a bonus soundtrack for the game, including tracks that didn’t make it to the original soundtrack release. It’s awesome that Amanita has released it for free, and you’re going to see the tracks you really wanted, such as the robot band’s song, or the track on the radio with the… wrench robot thing.
You can get your free download from here (packaged or individual). If you don’t know what Machinarium is, play the demo first and ask questions later.