The Bridal Chorus is traditionally played at Western weddings, and is thus commonly known as "Here Comes the Bride". It has become one of the most famous pieces of music in the world.
ACT II. The courtyard outside the cathedral. It is night. Telramund and Ortrud, who have been banished, appear in wretched garments. Ortrud endeavours to reanimate Telramund's courage. She is a heathen, the daughter of Radbod, the duke of Frisia, and deals in magic. She schemes to induce Elsa to ask Lohengrin the forbidden questions. When Elsa appears on the balcony in the light of the morning, she sees Ortrud and pities her. Telramund unobserved retires into the shadow of a house. The populace assembles and the Herald announces that the king has made Lohengrin Duke of Brabant, which title he refuses and wishes to be known only as "Guardian of Brabant." As the king, Lohengrin, Elsa and her attendants are about to enter the church, Ortrud, clad in magnificent attire, appears and accuses Lohengrin of being a magician, whose name Elsa herself does not know. Telramund also appears and claims to have been vanquished by fraud, as he does not know the name of his opponent. Lohengrin refuses to reveal his identity, saying that one only has the right to know his origin. To Elsa alone will he answer. Elsa assures him of her confidence, and they enter the church.
ACT III. The bridal chamber. Elsa and Lohengrin are ushered in with the well-known bridal chorus. They express their love for each other, but Ortrud's words are impressed upon Elsa, and, despite Lohengrin's warning, she asks the fatal question. Telramund rushes in to attack the knight, but is slain by Lohengrin, who sorrowfully turns to Elsa, and asks her to follow him to the king, to whom he will now reveal the mystery. Change of scene: On the banks of the Scheldt, as in Act I. The troops arrive equipped for war. Telramund's corpse is brought in, and Lohengrin defends his act. One thing remains, he must now disclose his identity to the king and Elsa. He tells the story of the Holy Grail, and reveals himself as Lohengrin, knight of the Holy Grail, and son of King Parsifal. The time for his return has arrived, he has only tarried to prove Elsa's innocence. As he sadly bids farewell to his beloved bride, the swan reappears. Lohengrin prays that Elsa may recover her lost brother, and lo! the swan dives into the river and appears again in the form of Gottfried, Elsa's brother, who had been turned into a swan by Ortrud's magic arts. A dove descends from heaven, and taking the place of the swan leads Lohengrin in his boat back to the castle of the Holy Grail.
References and external links: Plot taken from The Opera Goer's Complete Guide by Leo Melitz, 1921 version.