The German composer Timo Jouko Herrmann believes he has found a score in the Czech National Library that was composed jointly by Mozart and his arch-rival, Antonio Salieri.
It’s a solo cantata, listed in Köchel as K477a, and long believed to be lost. The text is by Lorenzo da Ponte, Mozart’s librettist, and the piece is thought to have been written for the English soprano, Nancy Storace, the original Susanna in Marriage of Figaro. At the time, Salieri was writing Ofelia for her in his opera La Grotta Di Trofonio.
The premiere of K477a by Storace was widely reported, but no-one since then has had sight of the score. It contains, says Herrmann, a ‘Song of Joy’ jointly written by Mozart and Salieri.
Sensational, if authenticated.
Timo interview here. (Spoiler alert: expect Classic FM to steal this story.)