A small pipe organ in Halberstadt, eastern Germany, is performing a single musical composition that will not conclude until the year 2640 [1].
The project tests the limits of musical perception and endurance by interpreting a composer's instructions literally. By extending a single piece over centuries, the performance transforms a musical work into a long-term architectural and temporal installation.
The John Cage Organ Project Halberstadt is playing the piece titled "Organ²/ASLSP" [1]. The composition follows a specific instruction from Cage to play the music "as slow as possible" [1], [2]. To achieve this, the organ operates at an extremely slow tempo, with notes changing infrequently over the course of years.
This specific performance began in 2001 [3]. As of this week, the organ has been playing for about 25 years [1]. Despite this quarter-century of continuous sound, the project is only in its early stages. Only four percent of the work has been completed [3].
The total duration of the project is estimated to span 639 years [2]. Because the tempo is so glacial, the music transcends the typical experience of a concert, creating a sonic environment that exists across generations.
Located in the town of Halberstadt, the instrument serves as a permanent fixture of the community. The project continues to redefine how slowly music can be played while maintaining the integrity of the original composition [2].
“The project is only in its early stages. Only 4% of the work has been completed.”
This performance represents a shift from traditional music to conceptual art, where the passage of time becomes the primary medium. By committing a physical instrument to a 639-year timeline, the project challenges modern notions of immediacy and digital speed, requiring a multi-generational commitment to a single artistic vision.


