Jacques Offenbach: Operettas Overtures (1865-1867)
Are Missing:
-Les refrains des bouffes (1865): The libretto is lost (the only case in all the 98 operettas)
-La leçon de chant électromagnétique (1867): I did not find a recording of the Ouverture (If I find it, I will upload it!)
Note: Geneviève de Brabant (is in the revised version)
Good listening by MikoNatt!