# Previously unknown Mozart work uncovered in Leipzig library and added to Köchel revision

*By IO Digest Desk*

Researchers working on the latest revision of the definitive catalogue of Mozart’s music have identified a previously unknown piece by the composer in a German library, adding a rare new work to one of classical music’s most studied bodies of writing. On event date 2024-09-19, Leipzig municipal libraries said the composition, known as “Ganz kleine Nachtmusik,” consists of seven miniature movements for string trio and lasts about 12 minutes [Source 457].

The discovery is notable precisely because Mozart’s output has been catalogued, performed and scrutinised for centuries. According to the supplied Guardian extract, the piece probably dates from the mid to late 1760s, when Mozart was in his early teens. That timing places it in the period of his child prodigy years, when he was already composing under the guidance of his father. A new work from that era does not transform the broad outline of Mozart’s career, but it does refine the record of how early and how extensively he was writing [Source 457].

The manuscript itself was not written in Mozart’s own hand. Researchers believe it is a copy made around 1780, a fact that shapes how the work is authenticated and interpreted. In music scholarship, autograph manuscripts carry one kind of authority, while later copies rely on chain of transmission, style and archival context. The extract indicates that the librarians and catalogue researchers considered the evidence strong enough to include the work as part of the new Köchel catalogue revision, a significant scholarly decision in its own right [Source 457].

The route to discovery was also scholarly rather than theatrical. The piece emerged while researchers were compiling the newest edition of the Köchel catalogue, the long-standing chronological archive of Mozart’s compositions. That means the find was not the result of an accidental performance revelation or a private collection sale, but of slow archival work inside a public library system. Such discoveries tend to matter because they come with institutional checks, documentation and immediate integration into the accepted reference framework [Source 457].

The supplied extract says the piece was performed by a string trio at the unveiling of the new catalogue in Salzburg on the same day the discovery was announced, and that it would receive its German premiere at the Leipzig Opera on the following Saturday. Those details moved the work quickly from archive to public hearing, giving scholars and audiences alike a first chance to judge how the music sounds rather than treating it only as a bibliographic update [Source 457].

What the supplied evidence supports is careful but important: a seven-movement Mozart piece from his youth was identified in Leipzig, the surviving source appears to be a copy rather than an autograph, and the work has been important enough to feature in the new Köchel catalogue and immediate performance plans. For a composer whose canon seems fixed, even a 12-minute addition is a substantial event. It expands the documented edges of Mozart’s early creativity and reminds scholars that major archives can still yield genuinely new material [Source 457].