A spoken introduction with orchestral accompaniment (Introduction and Melodrame) opens the work. Public Opinion explains who she is – the guardian of morality ("Qui suis-je? du Théâtre Antique"). She says that unlike the chorus in Ancient Greek plays she does not merely comment on the action, but intervenes in it, to make sure the story maintains a high moral tone. Her efforts are hampered by the facts of the matter: Orphée is not the son of Apollo, as in classical myth, but a rustic teacher of music, whose dislike of his wife, Eurydice, is heartily reciprocated. She is in love with the shepherd, Aristée (Aristaeus), who lives next door ("La femme dont le coeur rêve"), and Orphée is in love with Chloë, a shepherdess. When Orphée mistakes Eurydice for her, everything comes out, and Eurydice insists they abandon the marriage. Orphée, fearing Public Opinion's reaction, torments his wife into keeping the scandal quiet using violin music, which she hates ("Ah, c'est ainsi").