"Fans have flocked to a church in Germany to hear a chord change in a musical composition that lasts for 639 years ," reports the BBC. "It is the first change in the piece, As Slow As Possible, in seven years."The Guardian reports:The BBC notes the score for the 639-year composition is just eight pages long. But though the piece was written in the 1980s, it wasn't until nine years after the composer's death in 1992 that anyone dared to attempt playing it. That performance then began — with a pause that lasted nearly 18 months.The next chord change is scheduled for February 5 of the year 2022.