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Re:A composer wrote a three-hour piano piece using just one ... by Sevores on Saturday June 17, 2017 @10:06AM (#14575946)
Also worth mentioning Terre Thaemlitz, who wrote a nearly 30 hour piece with two chords.

"The resulting MP3 file is an edit of a 31+ hour piano solo recorded in sittings averaging 4 to 6 hours in length. The theme is "Meditation on Wage Labor and the Death of the Album.""

You can listen to an excerpt here: http://www.comatonse.com/writings/2012_soulnessless.html#c5

And here's the sheet music: http://i.imgur.com/DoD1Ew4.jpg

Re:A composer wrote a three-hour piano piece using just one ... by ajnin on Saturday June 17, 2017 @12:59PM (#14576653)
All sound samples on the page start playing at once when visiting it. A bit disconcerting but I guess that counts as involuntary experimental music in itself.