Watch VoirFilms. Not exactly a standard work in the repertoire, Mozart´s two-act serenata from 1775 (he was 19) Il re pastore, libretto by Metastasio and previously used by several other composers, such as Gluck. A story including the usual ingredients of fidelity, love and a benevolent ruler, whose element of rigid opera seria are emphasized by director-and-conductor Thomas Hengelbrock in this stylized set-up.