Bartholomäus Traubeck created equipment that would translate tree rings into music by playing them on a turntable. Rather than use a needle like a record, sensors gather information about the wood’s color and texture and use an algorithm that translates variations into piano notes. The breadth of variation between individual trees results in a individualized tune. The album, appropriately titled “Years,” features spruce, ash, oak, maple, alder, walnut, and beech trees.
Source, with audio, here.