The most monumental note change in years happened over the weekend. Watch/listen here.

As previewed in this space last week, an insanely rare musical moment was executed on Saturday when a new set of tones emerged from the organ in Germany’s Halberstadt Cathedral. The instrument was constructed for one purpose only: To perform John Cage’s “As Slow As Possible” as slow as possible. In this case, 639 years.

Since the “performance” began in 2001, there have been 14 “impulses,” with the 15th occurring his past Saturday, the first such move since October 13, 2013, a length of 2,527 days. The score went from playing a drone of d#’, a#’, e” to  g#, e’ by adding a new pipe to the organ. That will last until February 5, 2022 (518 days).

Many dozens lined up to be part of the event.

What did this switch look/sound like? Glad you asked.