The is a vital, specialized database maintained by the Major Orchestra Librarians' Association (MOLA) to catalog and correct errors in printed orchestral music scores and parts. The Purpose of MOLA Errata Lists

: MOLA uses these documented errors to communicate with music publishers. By providing clear evidence of systemic mistakes, they advocate for more accurate new editions and "corrected" reprints of existing works. Why It Matters for Musicians and Conductors

Tracking ownership to ensure clear accountability.

In the world of professional orchestral music, precision is paramount. A single wrong note, missing slur, or incorrect articulation in a printed part can derail a rehearsal, leading to wasted time and frustration for conductors and musicians alike. While music publishers aim for perfection, errors in scores and parts are inevitable, particularly in older or complex repertoire.

MOLA has created a . The association periodically invites representatives from music publishers to its annual conferences to address the publication and condition of printed orchestral materials. This collaborative effort has led to the formation of the MOLA/Publisher Committee and the creation of the “MOLA Guidelines for Music Preparation” brochure.

Identifying a blueprint or modeling error during the schematic design phase costs next to nothing. Discovering that same error during the construction phase can stall projects, waste materials, and cost millions of dollars in retrofitting. 3. Quality Assurance and Compliance