Oooooh. The G♯ that's playing in the Halberstadt performance of As Slow As Possible is about to be turned off in just five days!
Here's a Classic FM article (and a second article with more of a backstory focus) about the last chord change back in 2020, a video from WION about it which I haven't watched much of, the Reuters source for that event, and the piece's Wikipedia article.