World's slowest concert: John Cage organ piece in Germany marks 17th sound change after 25 years

In the historic Burchardi Church of Halberstadt, Germany, a unique musical experiment continues to unfold, captivating audiences with its extreme slowness. The church is the venue for John Cage's organ composition "ORGAN2/ASLSP" (As Slow As Possible), a piece that began its performance in 2001 and is meticulously planned to last for 639 years. This duration is a deliberate homage to the completion of the Nicolaus Faber organ in the Halberstadt Cathedral in the year 2000.

Recently, the 17th "sound change" occurred, marking a subtle but significant progression in the performance. This involved adding an A' pipe to the small organ, which now contributes to an eight-tone sound. Anneli Borgmann, who leads the project and chairs the John Cage Organ Foundation Halberstadt, described the evolving sound as creating a "beautiful sound carpet." She noted that the project embodies confidence through its multi-generational continuation, a concept she, as a geoecologist, can appreciate.

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It will create a beautiful sound carpet.

The performance is entirely automated, with no organist present. Instead, listeners experience a continuous, soft "wummern" that some compare to a machine room or the port of Hamburg. The pace is so deliberate that nearly 25 years into the performance, only about four percent of the total duration has been realized. Sound changes, or "Klangwechsel," are planned at intervals, with the next scheduled for October 2027 and multiple changes anticipated in 2028 and 2030. This gradual evolution, where 0.2 seconds of the original premiere translate to a month of the current performance, underscores Cage's radical exploration of time and sound.

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We are in turbulent times.