As Slow as Possible
Musical composition by John Cage
As Slow as Possible
Organ²/ASLSP (As Slow as Possible) is a musical piece by John Cage and the subject of the second-longest-lasting (after Longplayer) musical performance yet undertaken. Cage wrote it in 1987 for organ, as an adaptation of his 1985 composition ASLSP for piano. A performance of the piano version usually lasts 20 to 70 minutes. An organ in St. Burchardi church in Halberstadt in 2001 began a performance that is due to end in 2640. This makes it the longest running non-computerized piece currently being performed. The most recent note (an A4 pipe) was added on August 5, 2026. The next note will be played on October 5, 2027.
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