As Slow as Possible
Organ²/ASLSP (As SLow aS Possible) is a musical piece composed by John Cage and is the subject of one of the longest-lasting musical performances yet undertaken. 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 to 70 minutes. In 1985, Cage opted to omit the detail of exactly how slowly the piece should be played.
The score consists of eight pages, the tempo of which has been stretched to fit the wanted duration of 639 years.
The piece was commissioned by The Friends of the Maryland Summer Institute for the Creative and Performing Arts as a contemporary requirement for a piano competition. Cage employed an open format mainly to ensure that no two performances would be the same, providing the judges a break from the monotony of most compositions.
On February 5, 2009, Diane Luchese performed "Organ²/ASLSP" from 8:45 AM to 11:41 PM in the Harold J. Kaplan Concert Hall, Towson University. This 14 hours and 56 minutes uninterrupted and complete performance, with strict adherence to the score's temporal proportions, is the longest documented performance of the piece by a single human so far, although a full 24-hour version of the original piece, ASLSP, was performed by Joe Drew during the ARTSaha! festival in 2008. Drew has also given 9 and 12-hour performances of the piece, and is currently planning a 48-hour performance.
On September 5, 2012, as part of John Cage Day at the University of Adelaide, Australia, Stephen Whittington performed an 8-hour version of ASLSP on the Elder Hall organ. The eight sections of the work were each allocated one hour of time, with each section being divided into segments of one minute, within which the precise timing of events was left open. In performance, seven sections were played, with one omitted and one repeated. Organ registrations were determined by chance procedures.
Halberstadt performance 
A 1997 conference of musicians and philosophers discussed the implications of Cage's 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. A pipe organ that has been properly maintained has no finite life-span. The length was decided due to the first documented permanent organ installation, in the cathedral of Halberstadt in 1361, 639 years before the proposed start date in the year 2000. Therefore the piece was to be performed in the St. Burchardi church in Halberstadt, Germany, beginning in the year 2000 and lasting 639 years.
The instrument 
An organ built specifically for this performance was completed in 2009. It stands in the right transept of the Burchardi-church, while the bellows are in the left. Between January and May 2005, it contained only six pipes. Because the instrument sounds constantly, there is a cube of acrylic glass around it to reduce the sound emissions.
The actual performance commenced in the St. Burchardi church on September 5, 2001 with a pause lasting until February 5, 2003. The first chord was played from then until July 5, 2005. A recent new chord from the organ was a three-note chord, A above middle C, C above middle C and the F# above that (A4-C5-F#5), which began on January 5, 2006 and concluded on July 5, 2008. This sonority can currently be heard on a website devoted to the Halberstadt event.
The latest musical event from the organ is a new chord (C4-A flat4). On July 5, 2008, the weights holding down the organ pedals were shifted resulting in the 6th chord change. Two more organ pipes were added alongside the four installed and the tone became more complex at 15:33 local time. A machine, called a bellows, provides a constant supply of air which keeps the pipes playing.
The performance is planned to continue until September 5, 2640.
Sound changes 
The note change of January 5, 2006 takes place at 8:36 in this audio clip.
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The piece started with a rest of seventeen months, beginning September 5, 2001, which was Cage's 89th birthday. The first sound appeared on February 5, 2003. Further dates for changing notes are:
- July 5, 2004
- July 5, 2005
- January 5, 2006
- May 5, 2006
- July 5, 2008
- November 5, 2008
- February 5, 2009
- July 5, 2010
- February 5, 2011
- August 5, 2011
- July 5, 2012
- October 5, 2013
- September 5, 2020
On these dates St. Burchardi usually is well visited. The sound change of January 5, 2006, is available as an audio file.
See also 
- 'World's longest concert' resumes, Steve Rosenberg, BBC News (2008-07-05). Accessed 2008-07-05.
- "The Towerlight, Fifteen hours at the organ". Media.www.thetowerlight.com. Retrieved 2011-08-30.
- "Joe Drew's Bio". Analogarts.org. Retrieved 2011-08-30.
- "Stephen Whittington: Musical Renewal". RealTime. Retrieved 2012-09-27.
- "News and Events". J.M. Coetzee Centre for Creative Practice. Retrieved 2012-09-27.
- "John Cage Day, Wednesday 5th September 2012". Retrieved 2012-09-27.
- "John Cage Day Celebrated in Adelaide with Free Concert in Elder Hall". Herald Sun Newspaper. Retrieved 2012-09-27.
- First notes for 639-year composition, BBC News (2003-02-05). Accessed 2008-07-05.
- "the Halberstadt event website". John-cage.halberstadt.de. 2004-11-19. Retrieved 2011-08-30.
- "dw.de, One Thousand Hear Change of Note in World's Longest Concert". DW.de. Retrieved 2011-08-30.
- Wakin, Daniel J. (6 May 2006). "John Cage's Long Music Composition in Germany Changes a Note". The New York Times. Retrieved 25 June 2011.
- Website of the Halberstadt event (German)
- As Slow As Possible, Performance Today feature (National Public Radio), September 2003
- Recordings of a nine-hour performance of ASLSP at ARTSaha! 2006 by Joseph Drew: Hour One, Hour Six, Hour Nine
- (German) Die eingefrorene Zeit, Die Zeit, January 8, 2006
- Website of the documentary film 'ASAP' by Scott Smith
- World's longest concert will last 639 years The Washington Post. November 21, 2011.