Artist Bartholomäus Traubeck created a machine to play cross-sections of trees like records, reading the annual rings in the wood like grooves. The mechanism uses an Arduino controller and a Playstation Eye Camera to analyze the lines present in the wood, and then a program translates the visual cues into a virtual piano instrument. In an interview on Motherboard, Traubeck says:
yes every tree produces a different composition. Sometimes it’s more obvious , sometime it’s not. The effect can be examined best by comparing different types of trees, for example fir tree sounds a lot more minimalistic and has a very abstract rhythm compared to an ash tree which is more full sounding and rhythmic and loud.