John Cage's 639 year long performance

In an earlier post I wrote about US composer John Cage and his silent piano piece titled 4'33". Malcolm brought to my attention that in a small abandoned church in eastern Germany John Cage's 'biggest/longest' concert is being performed. The concert lasts 639 years in total, with the first year and a half of the concert being silence. The first chord played in February 2003, and in January 2006 the chord changed to the second one.

The organ is having additional pipes made and installed in advance of them being used in the concert.

What struck me about this concert is how Cage has shifted time beyond the human expectations of how long a concert normally lasts. If whales could hear the concert I wonder if they would find it more interesting than most people will. If there are intelligent extraterrestrials out there monitoring what we on earth are doing would they think this is interesting to listen to instead of the high pitched mosquito buzz of normal human communications?

P.S. The next chord change is scheduled for a few years from now. Make sure you don't miss it!