A small notebook found in the Bibliothèque Nationale de France (the national library of France) has turned out to be one of the most important Wolfgang Amadeus Mozart discoveries in decades.
The 44 pages of the notebook document composition lessons that Mozart gave in Paris in 1778 to Marie-Louise-Philippine de Bonnières de Guînes, a highly accomplished young aristocratic harpist. The manuscript was recognised in February 2026 by François-Pierre Goy, a curator in the library’s music department who recognised Mozart’s handwriting in the unattributed notebook. Laurence Decobert, a specialist in Mozart’s manuscripts, agreed with him and Armin Brinzing, director of the Bibliotheca Mozartiana in Salzburg, later authenticated the document.
