A unique musical project is underway in eastern Germany, where a small organ has been playing a single composition at a very slow pace. The piece, by composer John Cage, has been playing for nearly 25 years and is expected to continue until 2640. The project recently marked a rare chord change, shifting from seven notes to eight.

This change represents a small portion of the overall piece, which is expected to take 639 years to complete. Further details about the John Cage Organ Project Halberstadt are available from the source. The project is being followed by those interested in its slow progression, and is described as a unique experience.