As Slow As Possible

Organ²/ASLSP (As SLow aS Possible) is a musical piece composed by John Cage. It was originally written in 1987 for organ and is adapted from the earlier work ASLSP 1985; a typical performance of the piano piece lasts for about 20 minutes. A 1997 conference of musicians and philosophers discussed the implications of his instruction to play the piece "as slow as possible", given that an organ imposes virtually no time limits. A project emerged to perform the piece so that it would take a total of 639 years to play. This length was decided based on the estimated lifespan of the organ. The origin of this number is as follows: the piece was to be performed in the St. Burchardi church in Halberstadt, Germany, beginning in the year 2000; 639 years earlier, in the year 1361, the first big organ had been constructed in that church.
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