In Mozart’s opera Thus Do All the Sisters, the sisters Fiordiligi and Dorbella sing two completely opposite duets – the first a duet that is all about loyalty to their lovers, and the second a duet of betrayal in which they encourage each other to choose a lover. And how is all this expressed in the music that Mozart wrote? David Zeba, together with Anat Czerny and Yael Levita , will reveal to you in an episode of A Moment of Opera.