The Longest Lasting Musical Performance A S L A P by John Cage
John Cage created the composition ORGAN²/ASLSP for organ 1987 (originally composed for piano in 1985). The slowest organ music performance ASLSP – As Slow aS Possible – was realized by the John-Cage-Organ-Project -Foundation in the monastery Burchardi-Kirche in Halberstadt, Germany. The next sound change will take place in October, 5th 2020.
Find more about this art project: http://www.aslsp.org/de/das-projekt.html