"639-Year-Long John Cage Organ Performance Marks Rare Chord Change"
In 1987, John Cage composed "ORGAN2/ASLSP (As Slow As Possible)" for organ to be played as slowly as possible, and since 2001, an organ in Halberstadt, Germany has been performing a 639-year version of the piece. The first chord change in two years occurred recently, with volunteers adding a new pipe to create a new sound. The project is scheduled to continue until 2640, with the next chord change set for August 5, 2026.