Limits RegistryPUBLIC RECORD
Limits RegistryA performance of John Cage's Organ²/ASLSP ('As Slow As Possible') began on September 5, 2001 at St. Burchardi church in Halberstadt, Germany, and is scheduled to last 639 years, ending in 2640. Notes change only every few months or years, with chord changes drawing visitors from around the world.
The question, scope, and sources behind this Registry record.
A performance of John Cage's Organ²/ASLSP ('As Slow As Possible') began on September 5, 2001 at St. Burchardi church in Halberstadt, Germany, and is scheduled to last 639 years, ending in 2640. Notes change only every few months or years, with chord changes drawing visitors from around the world.
The longest planned duration of a single, continuously sounding performance of one musical composition.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
This record has no editable parameters. Read the formal question and assumptions before challenging it.
Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
Permanent ID limitsregistry.com/limits/LR-LONGEST-MUSICAL-PERFORMANCE
No active verified bounties are linked to this Limit.
View verified bounty tracker ↗No accepted machine-checked reproductions are recorded for this Limit.
Limits Registry. LR-LONGEST-MUSICAL-PERFORMANCE. Longest musical performance. 2026.