(Credit: © Wolfgang Lienbacher)

The International Mozarteum Foundation has announced a major acquisition of 12 original Mozart family holographs, marking one of the most significant additions to its manuscript holdings in nearly 150 years.

The materials, formerly part of the private collection of Hans Joachim Eggers (1927–2016), entered the Foundation largely through donation and are now part of the Bibliotheca Mozartiana.

Among the acquisitions are manuscripts is the only surviving manuscript copy of “Miserere” KV 85 (1770), written by Leopold Mozart as well as two autograph letters by Wolfgang Amadeus Mozart dating from 1787 and 1778.

Eggers, a Cologne-based virologist, began acquiring Mozart manuscripts at auction in 1975 and by the mid-2000s, he had assembled the largest private collection of Mozart manuscripts in Germany or Austria since World War II.

Selected items from the Eggers Collection will be displayed publicly for the first time in the exhibition that runs through Feb. 1, 2026 at the Mozart Residence in Salzburg.

All letters, documents, and music manuscripts from the Eggers Collection are also available in digital form via the Bibliotheca Mozartiana.

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