Visitors and journalists have been coming to see the organ in the Burchardi Church to witness the sound change in the world's slowest piece of music. Matthias Bein/dpa
Twenty-two years into the slowest piece of music in the world, a significant musical development has taken place — a slight chord change.
The 639-year organ piece by experimental composer and philosopher John Cage has added a single tone to the chord in the church where it is being continuously played in the German town of Halberstadt.
The six-note chord, played in the Burchardi Church since February 2022, has now evolved into a seven-note one with the addition of a pipe playing a D note set to sound continuously for another four and a half years (until August 2028).
