Pergolesi’s comic operas sound remarkably modern—which is to say, like Mozart. Recognizably human characters go through recognizable experiences, singing out their feelings very directly, which the music embodies in fluidly changing tempos and moods, stretching of harmony, changes of key and orchestral color. Much is accomplished through musically creative recitative—a half-spoken way of proceeding—as well as through song proper and duets (there are only two singers in each of these operas, though also some designated silent performers, to which this production added a few dancers). It is like Mozart, but sets the procedure for opera ever since, even Verdi’s with their heroic figures, Wagner’s with their gods and goddesses, Berg or Britten with their neurotics. Characters live, feel, and think—and sing—and the music moves quickly and supply and thinks, as it were, with them.