An organ playing a 639-year-long piece of music has changed chord for the first time in two years. Crowds gathered at a church in Germany to witness the rare moment, which is part of an artistic feat by avant-garde composer, John Cage.

639-year-long John Cage organ piece changes chord

Dozens of mask-wearing music enthusiasts in a church in an eastern German town on Saturday (September 5) witnessed the first note change in seven years in the world's longest lasting pipe organ performance.

As slow as possible: German organ changes note for first time in years

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639-year-long John Cage organ piece changes chord

As slow as possible: German organ changes note for first time in years