Music for tree huggers

This is a video made by the artist Bartholomäus Traubeck. He's cut a disk from a tree trunk and mounted it to a turntable where, as it spins like an old record album, it is optically scanned. The signal from the scan is then analyzed, manipulated and output to an electronic piano.

The highly processed output is billed as the music of trees. Well, if you say so...