A performance of John Cage's organ piece 'As Slow as Possible' in Halberstadt, Germany, began in 2001 and is scheduled to last _____.

THE TRUTH

639 years

Organ²/ASLSP is a musical piece by John Cage and the subject of the second-longest-lasting 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.

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