The is a resource maintained by the Major Orchestra Librarians' Association (MOLA) to document and correct errors in published orchestral scores and parts. These lists are vital for orchestral librarians and conductors to ensure that the music being performed is accurate and matches the composer's original intent. Common corrections found in these lists include:

Contains scholarly articles that may highlight errata. Conclusion: A Gift of Musical Expertise

When red or black commercial fabric runs during the washing (the mola is washed after sewing to set the layers), the dye bleeds into the lighter contrasting layers. Any pink halo or gray smudge around a cut edge is a Level 2 Errata. If bleeding obscures a face or figure, it is a Level 1 (irreparable) errata.

: The committee facilitates the creation of new lists and updates the database, notifying members through the quarterly newsletter Marcato .

In a profession where “to have the right music in the right place at the right time” is the highest calling, the MOLA errata list is an indispensable tool. It embodies the spirit of collaboration that defines the orchestral community—librarians sharing their hard‑won knowledge so that every orchestra, every conductor, and every musician can perform at their best.

To ensure librarians can triage their work under tight deadlines, many contributors to the database use urgency codes:

A properly formatted MOLA errata list is a model of clarity and precision. To ensure consistency and ease of use, the community has developed a standard format for entering errata. The format follows this pattern:

: The physical structural marker inside the score.

At its core, the is a living document—originally a thread on the scientific illustration forum SciArt-L and later archived on various natural history blogs—that catalogs common errors found in depictions of the ocean sunfish.

They hunt squid, fish, salps, and crustaceans in the deep ocean.

On the surface, a world-class orchestra seems like a marvel of spontaneous artistry. However, beneath the polished performance lies a hidden and meticulous world of preparation. At the center of this world is a MOLA Errata List, a crucial reference that acts as the conductor's secret weapon, enabling the music to sound flawless. Long before the first note is played, this list of corrections helps to refine every single part of the printed score.

The definitive is the most critical quality-control resource in the world of professional orchestral performance. Curated exclusively by the Major Orchestra Librarians' Association (MOLA) , this comprehensive database catalogs thousands of engraving mistakes, wrong notes, and discrepancies found within printed classical sheet music.