World’s longest concert sounds second chord

“A new chord has sounded in the world’s slowest and longest concert, which will take 639 years to perform.

An abandoned church in eastern Germany is the venue for the 639-year-long performance of a piece of music by American experimental composer John Cage.

The performance of “organ2/ASLSP” (or “As SLow aS Possible”) began in the Buchardi church in Halberstadt on September 5, 2001, and is scheduled to last until 2639.

The first year-and-a-half of the performance was total silence, with the first chord, G-sharp, B and G-sharp, not sounding until February 2, 2003.” (ABC.net.au)