Why can no musical notation system capture every detail of a performance exactly?

No musical notation system can capture every detail of a performance exactly because notation is inherently an imperfect, selective process designed primarily as an aid to memory or communication rather than a comprehensive recording of sound.1

In practice, notation systems typically focus on a selection of elements—such as pitch and rhythm—while struggling to handle other nuances like timbre, volume, or delicate gradations of expression with precision. Because these finer musical points are difficult to indicate directly, they must ultimately stem from the performer’s own interpretation or a familiar performance tradition.123

Furthermore, notation is limited by the aesthetic and cultural context of its time. For instance, Western staff notation is often ill-equipped to represent non-Western scales, microtonal fluctuations, or music where the concept of a stable "note" is foreign. Even in modern contexts, attempting to notate every technical detail can result in a cluttered, unreadable score, while indeterminate or chance music intentionally relies on imprecision to allow for performer choice. Ultimately, notation serves as a framework, leaving the task of refining and enriching the music to the performer as an interpreter.345