: For major errors, librarians should physically mark the parts before rehearsal. For minor ones, distributing a printed list for players to fix themselves is acceptable.
Even the most famous and frequently performed works, such as Beethoven’s symphonies, contain printing errors. These inaccuracies can include: Mola Errata List
was a king of paper and ink. As a performance librarian, his job wasn’t just to organize scores—it was to ensure they were actually playable. On his desk lay the , a sacred text compiled by the Major Orchestra Librarians' Association (MOLA). : For major errors, librarians should physically mark
[Printed Music Score] vs [Instrumental Parts] │ │ └───────────┬───────────┘ ▼ MOLA Errata List Verification ▼ Manual Correction by Performance Librarian ▼ Flawless Orchestral Rehearsal Anatomy of a MOLA Errata Entry : For major errors