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Organ 2 /ASLSP (As Slow as Possible) is a musical piece by John Cage and the subject of one of the longest-lasting musical performances 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 …