Le postillon de Lonjumeau is an opéra-comique in three acts by Adolphe Adam to a French libretto by Adolphe de Leuven and Léon Lévy Brunswick. The opera has become the most successful of Adam's works, and the one by which he is best known outside his native France. The opera is known for the difficult aria "Mes amis, écoutez l'histoire" which has been called a test for tenors because of the demanding high D, or D5, at the end of the aria.
Act 1 The newly married postilion, or coachman, and his wife, an innkeeper, to ensure that their marriage will be a joyous one, decide to consult a clairvoyant, who predicts that things will not go smoothly in their marriage but does not state exactly what will occur nor when. Initially concerned, their thoughts are temporarily forgotten as they enjoy their wedding night. Several days into the marriage, the Marquis de Corcy arrives at the inn that Madeleine owns and Chapelou works at. He is immediately smitten with Chapelou's wife, but doesn't say anything to her. Then he overhears her husband singing his ‘usual’ song with other guests at the inn, and is impressed with his beautiful voice. He decides to invite the young coachman to join the Marquis’s company, but they have to leave immediately. With excitement, Chapelou asks his friend, Biju, to tell his wife where he has gone and what he plans to do. Chapelou and the Marquis then quickly depart for Paris, leaving Madeleine in a state of shock. Act 2 Ten years later. By now Madeleine has come into an inheritance and is known as Madame Latour, and Chapelou has become a star at the Paris Opera. After a performance, the Marquis holds a reception to which he has invited Madame Latour. As soon as they meet at the reception, Chapelou falls for the Madame's charms, not recognising the wife he left behind. He proposes, she accepts, and a wedding occurs. Act 3 The Marquis has gone to inform the police and denounce this apparent act of bigamy. On the wedding night, Madeleine appears in her old peasant clothes and Chapelou recognises her. Then she transforms before his eyes into Madame Latour, the rich heiress. She reveals her deception to the Marquis, as he arrives with the police and declares to them her game – the couple have married twice and vow from that day on to love like good village people. This induces a hearty response from the chorus to provide a stirring finale.