This is an excerpt from the record Years, created by Bartholomäus Traubeck, which features seven recordings from different Austrian trees including Oak, Maple, Walnut, and Beech.
What you are hearing is an Ash tree's year ring data. Every tree sounds vastly unique due to varying characteristics of the rings, such as strength, thickness and rate of growth.
Keep in mind that the tree rings are being translated into the language of music, rather than sounding musical in and of themselves. Traubeck's one-of-a-kind record player uses a PlayStation Eye Camera and a stepper motor attached to its control arm. It relays the data to a computer with a program called Ableton Live. What you end up with is an incredible piano track, and in the case of the Ash, a very eerie one.
Hats off to Traubeck for coming up with the ingenious method to turn a simple slice of wood into a beautiful unique arraignment. It makes you wonder what types of music other parts of nature would play.
Below is the full 5:21 created by a Fraxinus (Ash):
Sources: Real Farmacy, Traubeck, Live Science, Vimeo