A change of tone after 7 years - John Cage's composition progresses

Saturday afternoon (September 6) an organ chord that's been held since October 2013 will change in Halberstadt, Germany. It's a musical and concept piece, part of a 639-year performance of John Cage's 'Organ2/ASLSP (As Slow As Possible)'. Saturday's chord will be held for the next 20 months. Check out the latest chord here. Soprano singer Johanna Vargas and organist Julian Lembke manually changed the chord on Saturday, drawing hundreds of fans to witness the event, Associated Press reports. The composition is played on a special organ built specifically for this piece, with a compressor in the basement blowing air into the pipes to create a continuous sound. If all goes according to plan, the performance will end in 2640.