Discovery of Compositions by the Duchesse de Guines (with contributions by Mozart)

For more information:

https://www.bnf.fr/en/actualitesEN/discovery-unpublished-autograph-manuscript-mozart-bnf-music-department

See also:

https://www.researchgate.net/publication/380513844_Mozart's_First_Composition_Student_Mlle_de_Guines_1759-95_Mozart-Jahrbuch_2002_pp_9-20