In the small German town of Halberstadt, a mysterious musical composition, called Organ²/ASLSP (As Slow as Possible), is being performed on a specially-built mechanical organ. The composition, begun in 2001, is set to finish playing in the year 2640. The town's church has become a hub of intrigue and anticipation, attracting music enthusiasts, historians, and curious individuals from around the world. As an aspiring detective, you arrive in Halberstadt to unravel the secrets hidden within the composition and investigate the significance of its chord changes. Can you decipher the cryptic messages embedded in the music and unlock the truth behind this enigmatic masterpiece?