A small organ in eastern Germany is the headliner of the world’s slowest concert.

The organ of the John Cage organ project is illuminated prior to a 'sound change' at the partially ruined Buchardi Church in Halberstadt, Germany, Saturday, Sept. 5, 2020. Since 2001 an interpretation of the music peace 'Organ/ASLSP', As Slow As Possible, by US composer John Cage is performed on the organ. The music piece by the American composer John Cage is played on a special organ inside the medieval church. A chord change means that the sound of the organ pipes changes either because new sounds are added or existing sounds end. When a chord change happens, it's done manually.