La judía
Cohen wrote several compositions, one of which, the opera "l'Impératrice", was performed, about 1834, in Naples, Paris, and London. Moreover, he published four tracts about musical theory. On her advice as singing tutor, Marguerite Baux made her début in February 1876 as Rachel in "La Juive", although initially she had been expected to sing Marguerite in Gounod's "Faust."