Slowly does it: chord changes in John Cage's 639-year-long organ piece

Fans gather in a German church to hear the first new sound in composition, Organ/ASLSP, for six years

Hundreds of fans have attended a special kind of musical happening at a church in Germany: a chord change in an organ piece that is supposed to last for an entirety of 639 years.

The performance of the Organ/ASLSP (As Slow As Possible) composition began in September 2001 at the St Burchardi church in the eastern town of Halberstadt and is supposed to end in 2640 - if all goes well.