This is a catastrophic error: thread tension fails, and the bobbin thread loops into a tangled “nest” on the reverse. While many molas have messy backs, a true bird’s nest that distorts the front fabric’s flatness is an automatic reject for serious collections.
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The MOLA Errata List (or Database) is a comprehensive catalog of corrections for orchestral scores and parts, maintained by the Major Orchestra Librarians' Association (MOLA). It is a vital tool used by professional orchestra librarians to ensure musical accuracy and save time during rehearsals by addressing errors before musicians ever see the music. Key Features of the MOLA Errata Database
Comprehensive Coverage: The catalog includes errata for approximately 900 titles, ranging from standard repertoire like Beethoven symphonies to modern works. Mola Errata List
Broad Scope of Corrections: Beyond wrong notes, MOLA defines "errata" as anything that hinders a rehearsal, including bad page turns, poor fonts, inappropriate clefs, or discrepancies in "Frankenstein sets" (mismatched editions).
Standardised Reporting: Corrections are typically organized by instrument, rehearsal figure, measure number, and beat to provide clear, actionable instructions for librarians.
Collaborative Maintenance: The database is overseen by an Errata Committee, which sets standards for submission and updates the membership when new lists are available. Access and Use
Restricted Access: The full errata database is generally a benefit reserved for MOLA members. Non-members may need to consult a MOLA librarian to access specific lists.
Integration with Other Tools: MOLA often works in conjunction with other resources, such as the Daniels' Orchestral Music database, to provide a complete picture of a work's performance requirements. Policies and Bylaws - MOLA This is a catastrophic error: thread tension fails,
MOLA Errata List is a vital database maintained by the Major Orchestra Librarians' Association (MOLA)
. It serves as a centralized resource for performance librarians to identify and correct errors in published orchestral scores and parts. Purpose and Utility Rehearsal Efficiency:
By correcting errors before a set goes on the stands, librarians save expensive ensemble rehearsal time that would otherwise be spent identifying discrepancies between parts. Error Volume:
Even standard repertoire can contain significant mistakes; for example, some works have been noted to contain between 750 to 1,000 errors requiring correction in both scores and parts. Global Collaboration:
The list allows for a global pooling of information, where librarians from member orchestras share findings to support the broader library professional community. kennethwoods.net Access and Contributions Online Database: Members can search the errata database directly through the MOLA website Submissions: The MOLA Errata List (or Database) is a
Members are encouraged to submit new errata directly through the site, including the ability to upload PDFs for review by the Errata Committee New additions to the database are frequently highlighted in , MOLA’s quarterly newsletter. or find the errata for a particular composer FAQs - MOLA - Major Orchestra Librarians' Association
You might ask: Does it really matter if a cartoon sunfish has a tail?
According to marine biologists, yes. The Mola Errata List has become a tool for combating "taxonomic drift"—the phenomenon where public misunderstanding of an animal’s anatomy affects conservation efforts. For example, if the public believes the sunfish is a slow, vertical drifter (due to bad art), they may not support boat-speed regulations designed to protect it. In reality, Mola mola are powerful, laterally undulating swimmers.
Furthermore, the Errata List has been cited in two academic papers on Science Communication and Visual Bias (2018, 2021). It serves as a case study for how peer-review should apply not just to text, but to diagrams.
| Errata ID | Title | Version / Section | Type | Reported Date | Impact | Proposed Correction | Status | |---|---:|---|---|---:|---|---|---| | MOLA-ERR-001 | Incorrect example for array indexing | 1.2 / 4.3.1 | Bug | 2026-03-15 | High — causes runtime misinterpretation | Change example index from 1..n to 0..n-1 and add note about zero-based indexing. | Implemented | | MOLA-ERR-002 | Ambiguous definition of "merge" operation | 1.2 / 7.1 | Ambiguity | 2026-03-20 | Medium — different implementations behave differently | Clarify merge semantics: define precedence, conflict resolution rules, and order of application. | Proposed | | MOLA-ERR-003 | Typo: "commas" -> "colons" in grammar | 1.1 / Appendix A | Typo | 2026-02-02 | Low — documentation only | Replace "commas" with "colons" in grammar production G-12. | Accepted |