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费加罗（Ildar Abdrazakov 饰）是在阿玛维瓦伯爵手下任职的男仆，与同为女仆的苏珊娜（Marlis Petersen 饰）两情相悦，两人约定携手步入婚礼的殿堂。然而，阿玛维瓦伯爵贪恋苏珊娜的美貌已久，想方设法阻碍她和费加罗的结合，愤怒的费加罗决定利用自己的智慧，联手伯爵的妻子罗西娜给这个贪婪好色的老头子一点颜色瞧瞧。
苏珊娜给伯爵写了一封热情洋溢的信，约他在花园里见面。当夜，伯爵趁着月色准时赴约，隐约看到一女子站在树下，于是不分青红皂白就抱住她亲热了起来，哪知道这名女子不是苏珊娜，而是他的妻子罗西娜。

Place: Seville, Spain
Time: 18th century
Act 1
The square in front of Bartolo's house
In a public square outside Bartolo's house a band of musicians and a poor student named Lindoro are serenading, to no avail, the window of Rosina ("Ecco, ridente in cielo"; "There, laughing in the sky"). Lindoro, who is really the young Count Almaviva in disguise, hopes to make the beautiful Rosina love him for himself – not his money. Almaviva pays off the musicians who then depart, leaving him to brood alone. Rosina is the young ward of the grumpy, elderly Bartolo and she is allowed very little freedom because Bartolo plans to marry her once she is of age and thus appropriate her not inconsiderable dowry.
Figaro approaches singing (Aria: "Largo al factotum della città"; "Make way for the factotum of the city"). Since Figaro used to be a servant of the Count, the Count asks him for assistance in helping him meet Rosina, offering him money should he be successful in arranging this. (Duet: "All'idea di quel metallo"; "At the idea of that metal"). Figaro advises the Count to disguise himself as a drunken soldier, ordered to be billeted with Bartolo, so as to gain entrance to the house. For this suggestion, Figaro is richly rewarded.
A room in Bartolo's house with four doors
The scene begins with Rosina's cavatina, "Una voce poco fa" ("A voice a little while ago"). (This aria was originally written in the key of E major, but it is sometimes transposed a semitone up into F major for coloratura sopranos to perform, giving them the chance to sing extra, almost traditional, cadenzas, sometimes reaching high Ds or even Fs.)
Knowing the Count only as Lindoro, Rosina writes to him. As she is leaving the room, Bartolo and Basilio enter. Bartolo is suspicious of the Count, and Basilio advises that he be put out of the way by creating false rumours about him (this aria, "La calunnia è un venticello" – "Calumny is a little breeze" – is almost always sung a tone lower than the original D major).
When the two have gone, Rosina and Figaro enter. Figaro asks Rosina to write a few encouraging words to Lindoro, which she has actually already written. (Duet: "Dunque io son...tu non m'inganni?"; "Then I'm the one...you're not fooling me?"). Although surprised by Bartolo, Rosina manages to fool him, but he remains suspicious. (Aria: "A un dottor della mia sorte"; "To a doctor of my class").
Count Almaviva, disguised as a soldier and pretending to be drunk, enters the house and demands to be quartered there. In fear of the drunken man, Berta the housekeeper rushes to Bartolo for protection. Bartolo tells the "soldier" that he (Bartolo) has an official exemption which excuses him from the requirement to quarter soldiers in his home. Almaviva pretends to be too drunk and belligerent to understand, and dares Bartolo to brawl. While Bartolo searches his cluttered desk for the official document which would prove his exemption, Almaviva whispers to Rosina that he is Lindoro in disguise, and passes a love-letter to her. Bartolo suspiciously demands to know what is in the piece of paper in Rosina's hands, but she fools him by handing over her laundry list. Bartolo and the Count argue loudly. Basilio enters; then Figaro, who warns that the noise of the argument is rousing the whole neighborhood. Finally, the noise attracts the attention of the Officer of the Watch and his troops, who crowd into the room. Bartolo demands that the Officer arrest the "drunken soldier". The Officer starts to do so, but Almaviva quietly reveals his true identity to the Officer, and he (the Officer) backs off and stands down. Bartolo and Basilio are astonished and mystified; Figaro laughs quietly at them. (Finale: "Fredda ed immobile, come una statua"; "Cold and still, just like a statue"). The confusion intensifies and causes everyone to suffer headaches and auditory hallucinations ("Mi par d'esser con la testa in un'orrida fucina; dell'incudini sonore l'importuno strepitar."; "My head seems to be in a fiery forge: the sound of the anvils deafens the ear.")
Act 2
A room in Bartolo's house with a piano
Almaviva again appears at the doctor's house, this time disguised as a priest who is also a singing tutor and pretending to act as substitute for the supposedly ailing Basilio, Rosina's regular singing teacher. Initially, Bartolo is suspicious, but does allow Almaviva to enter when the Count gives him Rosina's letter. He describes his plan to discredit Lindoro whom he believes to be one of the Count's servants, intent on pursuing women for his master. While Almaviva pretends to give Rosina her singing lesson, Figaro arrives to shave Bartolo. Bartolo demurs, but Figaro makes such a scene he agrees, but in order not to leave the supposed music master alone with Rosina, the doctor has Figaro shave him right there in the music room. When Basilio suddenly appears, he is bribed by a full purse from Almaviva and persuaded to leave again, with much discussion of how ill he looks. (Quintet: "Don Basilio! – Cosa veggo!"; "Don Basilio! – What do I see?"). Figaro begins to shave Bartolo, but Bartolo overhears the lovers conspiring, and angrily drives everybody away.
The scene returns to the location of act 1 with a grill looking out onto the square. Bartolo orders Basilio to have the notary ready to marry him to Rosina that evening. He also explains his plot to come between the lovers. Basilio leaves and Rosina arrives. Bartolo shows Rosina the letter she wrote to "Lindoro", and persuades her that this is evidence that Lindoro is merely a flunky of Almaviva and is toying with her at Almaviva's behest. Rosina believes him and agrees to marry him.
During an instrumental interlude, the music creates a thunder storm to indicate the passage of time. The Count and Figaro climb up a ladder to the balcony and enter the room through a window. Rosina shows Almaviva the letter and accuses him of betraying her. Almaviva reveals his identity and the two reconcile. While Almaviva and Rosina are enraptured by one another, Figaro keeps urging them to leave. Two people are heard approaching the front door, who later turn out to be Basilio and the notary. However, when the Count, Rosina, and Figaro attempt to leave by way of the ladder, they discover it has been removed. The marriage contract requires two witnesses; Figaro is one, but another is needed. The Count makes Basilio an offer he can't refuse: the choice of accepting a bribe and being a witness to his marriage or receiving two bullets in the head (an easy choice, Basilio says). He and Figaro witness the signatures to a marriage contract between the Count and Rosina. Bartolo barges in, accompanied by the Officer and the men of the watch, but too late; the marriage is already complete. The befuddled Bartolo (who was the one who had removed the ladder) is pacified by being allowed to retain Rosina's dowry. The opera concludes with an anthem to love ("Amor e fede eterna, si vegga in noi regnar!").

The libretto follows the story of Shakespeare's play.
Act 1
Overture prologue:
A short chorus sets the scene of the rival families in Verona.
A masked ball in the Capulets’ palace
Tybalt talks to Pâris about Juliette, who appears with her father. Roméo, Mercutio, Benvolio and their friends enter, disguised, and Mercutio sings a ballad about Queen Mab, after which Juliette sings a joyful waltz song. The first meeting between Roméo and Juliette takes place, and they fall in love. But Tybalt re-appears and suspects that the hastily re-masked Roméo is his rival. While Tybalt wants immediate revenge, Capulet orders that the ball continue.
Act 2
The Capulets' garden
After Roméo's page Stephano has helped his master gain access, he reveals the two young lovers exchanging their vows of love.
Act 3
Scene 1: Laurent's cell
Roméo and Juliette, accompanied by Gertrude, go to the cell, and the wedding takes place. Laurent hopes that reconciliation between the houses of the Montagus and the Capulets may thus take place.
Scene 2: a street near Capulet's palace
Stephano sings to attract the occupants into the street. Gregoire and Stephano skirmish as men from each family appear. The duel is first between Tybalt and Mercutio, who falls dead, and then between Roméo, determined to avenge his comrade, and Tybalt. Tybalt is killed by Roméo, who is banished by the Duke.
Act 4
Juliet's room at dawn
Roméo and Juliette are together and, after a long duet, Roméo departs for exile. Juliette's father comes to remind her of Tybalt's dying wish for Juliette to marry Count Pâris. The friar gives Juliette a draught which will cause her to sleep, so as to appear as if dead and, after being laid in the family tomb, it is planned that Roméo will awaken her and take her away. [A ballet scene in the grand hall of the palace was inserted at this point.]
Act 5
Juliet's tomb
Roméo breaks into the tomb after having taken poison because he believes that Juliette is dead. When she awakes from the friar’s potion, the lovers' last duet is heard before the poison takes effect on Roméo. As her bridegroom weakens Juliette stabs herself, to be united with her lover in death.

Mozart and Da Ponte use the theme of "fiancée swapping", which dates back to the 13th century; notable earlier versions are found in Boccaccio's Decameron and Shakespeare's play Cymbeline. Elements from Shakespeare's The Taming of the Shrew are also present. Furthermore, it incorporates elements of the myth of Procris as found in Ovid's Metamorphoses, vii.
Place: Naples
Time: the 18th century
Act 1
Scene 1: A coffeehouse
In a cafe, Ferrando and Guglielmo (two officers) express certainty that their fiancées (Dorabella and Fiordiligi, respectively) will be eternally faithful. Don Alfonso expresses skepticism and claims that there is no such thing as a faithful woman. He lays a wager with the two officers, claiming he can prove in a day's time that those two, like all women, are fickle. The wager is accepted: the two officers will pretend to have been called off to war; soon thereafter they will return in disguise and each attempt to seduce the other's lover. The scene shifts to the two women, who are praising their men (duet: "Ah guarda sorella"—"Ah look sister"). Alfonso arrives to announce the bad news: the officers have been called off to war. Ferrando and Guglielmo arrive, brokenhearted, and bid farewell (quintet: "Sento, o Dio, che questo piede è restio"—"I feel, oh God, that my foot is reluctant"). As the boat with the men sails off to sea, Alfonso and the sisters wish them safe travel (trio: "Soave sia il vento"—"May the wind be gentle"). Alfonso, left alone, gloatingly predicts that the women (like all women) will prove unfaithful (arioso: "Oh, poverini, per femmina giocare cento zecchini?"—"Oh, poor little ones, to wager 100 sequins on a woman").
Scene 2: A room in the sisters' home
Despina, the maid, arrives and asks what is wrong. Dorabella bemoans the torment of having been left alone (aria: "Smanie implacabili"—"Torments implacable"). Despina mocks the sisters, advising them to take new lovers while their betrotheds are away (aria: "In uomini, in soldati, sperare fedeltà?"—"In men, in soldiers, you hope for faithfulness?"). After they leave, Alfonso arrives. He fears Despina will recognize the men through their disguises, so he bribes her into helping him to win the bet. The two men then arrive, dressed as mustachioed Albanians (sextet: "Alla bella Despinetta"—"Meet the pretty Despinetta"). The sisters enter and are alarmed by the presence of strange men in their home. The "Albanians" tell the sisters that they were led by love to them (the sisters). However, the sisters refuse to give in. Fiordiligi asks the "Albanians" to leave and pledges to remain faithful (aria: "Come scoglio"—"Like a rock"). The "Albanians" continue the attempt to win over the sisters' hearts, Guglielmo going so far as to point out all of his manly attributes (aria: "Non siate ritrosi"—"Don't be shy"), but to no avail. Ferrando, left alone and sensing victory, praises his love (aria: "Un'aura amorosa"—"A loving breath").
Scene 3: A garden
The sisters are still pining. Despina has asked Don Alfonso to let her take over the seduction plan. Suddenly, the "Albanians" burst in the scene and threaten to poison themselves if they are not allowed the chance to woo the sisters. As Alfonso tries to calm them, they drink the "poison" and pretend to pass out. Soon thereafter, a "doctor" (Despina in disguise) arrives on the scene and, using magnet therapy, is able to revive the "Albanians". The men, pretending to hallucinate, demand a kiss from Dorabella and Fiordiligi (whom the "Albanians" call goddesses) who stand before them. The sisters refuse, even as Alfonso and the doctor (Despina) urge them to acquiesce.
Act 2
Scene 1: The sisters' bedroom
Despina urges them to succumb to the "Albanians"' overtures (aria: "Una donna a quindici anni"—"A fifteen year old woman"). After she leaves, Dorabella confesses to Fiordiligi that she is tempted, and the two agree that a mere flirtation will do no harm and will help them pass the time while they wait for their lovers to return (duet: "Prenderò quel brunettino"—"I will take the brunette one").
Scene 2: The garden
Dorabella and the disguised Guglielmo pair off, as do the other two. The conversation is haltingly uncomfortable, and Ferrando departs with Fiordiligi. Now alone, Guglielmo attempts to woo Dorabella. She does not resist strongly, and soon she has given him a medallion (with Ferrando's portrait inside) in exchange for a heart-shaped locket (duet: "Il core vi dono"—"I give you my heart"). Ferrando is less successful with Fiordiligi (Ferrando's aria: "Ah, lo veggio"—"Ah, I see it" and Fiordiligi's aria: "Per pietà, ben mio, perdona"—"Please, my beloved, forgive"), so he is enraged when he later finds out from Guglielmo that the medallion with his portrait has been so quickly given away to a new lover. Guglielmo at first sympathises with Ferrando (aria: "Donne mie, la fate a tanti"—"My ladies, you do it to so many"), but then gloats, because his betrothed is faithful.
Scene 3: The sisters' room
Dorabella admits her indiscretion to Fiordiligi ("È amore un ladroncello"—"Love is a little thief"). Fiordiligi, upset by this development, decides to go to the army and find her betrothed. Before she can leave, though, Ferrando arrives and continues his attempted seduction. Fiordiligi finally succumbs and falls into his arms (duet: "Fra gli amplessi"—"In the embraces"). Guglielmo is distraught while Ferrando turns Guglielmo's earlier gloating back on him. Alfonso, winner of the wager, tells the men to forgive their fiancées. After all: "Così fan tutte"—"All women are like that".
Scene 4:
The scene begins as a double wedding for the sisters and their "Albanian" grooms. Despina, in disguise as a notary, presents the marriage contract, which all sign. Directly thereafter, military music is heard in the distance, indicating the return of the officers. Alfonso confirms the sisters' fears: Ferrando and Guglielmo are on their way to the house. The "Albanians" hurry off to hide (actually, to change out of their disguises). They return as the officers, professing their love. Alfonso drops the marriage contract in front of the officers, and, when they read it, they become enraged. They then depart and return moments later, half in Albanian disguise, half as officers. Despina has been revealed to be the notary, and the sisters realize they have been duped. All is ultimately forgiven, as the entire group praises the ability to accept life's unavoidable good times and bad times.

Place: Egypt
Time: 48–47 B.C.
As with most of his other operas, Handel made several revisions to the score of Giulio Cesare for revivals, adding new arias and cutting others. The listing of arias in this synopsis applies to the original 1724 version.
Abridged plot
Cesare, in pursuit of his enemy Pompeo, has followed him to Egypt. Pompeo's wife Cornelia pleads with Cesare to spare her husband. He is about to grant her plea, when the Egyptians led by their boy king Tolomeo bring him the head of Pompeo. Cornelia and Pompeo's son Sesto vow to avenge his death. Tolomeo's sister Cleopatra desires to depose her brother in order to become the sole ruler of Egypt. She joins Cornelia and Sesto in their plans for vengeance and entreats Cesare to aid her. Following her overtures, Cesare falls in love with Cleopatra. Her brother attempts to assassinate Cesare, but he escapes. It is reported to Cleopatra that Cesare has drowned while in flight. She is taken captive by her brother. Cesare, who has escaped drowning, enters to free his beloved. Tolomeo is slain by Sesto, because he forced himself upon Cornelia against her will. Cesare makes Cleopatra Queen of Egypt and returns to Rome.
Act 1
After the overture, the entire cast, except Giulio Cesare, gathers on stage for the opening chorus. (Chorus: Viva, viva il nostro Alcide). Giulio Cesare and his victorious troops arrive on the banks of the River Nile after defeating Pompeo's forces. (Aria: Presti omai l'Egizia terra). Pompeo's second wife, Cornelia, begs for mercy for her husband's life. Cesare agrees, but on the condition that Pompeo must see him in person. Achilla, the leader of the Egyptian army, presents Cesare with a casket containing Pompeo's head. It is a token of support from Tolomeo, the co-ruler of Egypt (together with Cleopatra, his sister). Cornelia faints, and Cesare is furious about Tolomeo's cruelty. (Aria: Empio, dirò, tu sei). Cesare's assistant, Curio, offers to avenge Cornelia, hoping that she will fall for him and marry him. Cornelia rejects the offer in grief, saying that another death would not relieve her pain. (Aria: Priva, son d'ogni conforto). Sesto, son of Cornelia and Pompeo, swears to take revenge for his father's death. (Aria: Svegliatevi nel core). Cleopatra decides to use her charm to seduce Cesare. (Aria: Non disperar, chi sà?) Achilla brings the news to Tolomeo that Cesare was furious over the murder of Pompeo. Tolomeo swears to kill Cesare to protect his rule of the kingdom. (Aria: L'empio, sleale, indegno). Cleopatra (in disguise) goes to meet Cesare in his camp hoping that he will support her as the queen of Egypt. Cesare is amazed by her beauty. (Aria: Non è si vago e bello). Nireno notes that the seduction was successful. (Aria: Tutto può donna vezzosa). Meanwhile, Cornelia continues to mourn the loss of her husband. (Arioso: Nel tuo seno, amico sasso). Cornelia prepares to kill Tolomeo to avenge Pompeo's death, but is stopped by Sesto, who promises to do it instead. Cesare, Cornelia and Sesto go to the Egyptian palace to meet Tolomeo. (Aria: Cara speme, questo core). Cleopatra now believes that as she has turned Cesare, Cornelia and Sesto against Tolomeo successfully, the scales are tipped in her favour. (Aria: Tu la mia stella sei). Cesare meets Tolomeo, who offers him a room in the royal apartments, though Cesare tells Curio that he expects Tolomeo to betray him. (Aria: Va tacito e nascosto). Tolomeo is fascinated by Cornelia's beauty but has promised Achilla that he could have her. (Aria: Tu sei il cor di questo core). Sesto attempts to challenge Tolomeo, but is unsuccessful. When Cornelia rejects Achilla, he orders the soldiers to arrest Sesto. (Duet: Son nata a lagrimar).
Act 2
In Cleopatra's palace, while in disguise as "Lidia", she uses her charms to seduce Cesare. (Aria: V'adoro, pupille). She sings praises of Cupid's darts and Cesare is delighted. Cesare is smitten with Cleopatra, and Nireno tells Cesare that "Lidia" is waiting for him. (Aria: Se in fiorito ameno prato). In Tolomeo's palace, Cornelia laments her fate. (Arioso: Deh piangete, oh mesti lumi). Achilla pleads with Cornelia to accept him, but she rejects him. (Aria: Se a me non sei crudele) When he leaves, Tolomeo also tries to win her, but is also rejected. (Aria: Sì spietata, il tuo rigore). Thinking that there is no hope, Cornelia tries to take her own life, but is stopped by Sesto, who is escorted by Nireno. Nireno reveals the bad news that Tolomeo has given orders for Cornelia to be sent to his harem. However, Nireno also comes up with a plan to sneak Sesto into the harem together with Cornelia, so Sesto can kill Tolomeo when he is alone and unarmed. (Aria: Cessa omai di sospirare). Sesto enters the garden of the palace, wishing to fight Tolomeo for killing his father. (Aria: L'angue offeso mai riposa). Meanwhile, Cleopatra waits for Cesare to arrive in her palace. (Aria: Venere bella). Still smitten with her, Cesare arrives in Cleopatra's palace. However, Curio suddenly bursts in and warns Cesare that he has been betrayed, and enemies are approaching Cesare's chambers and chanting "Death to Cesare". Cleopatra reveals her identity and after hearing the enemies heading for them, asks Cesare to flee, but he decides to fight. (Aria: Al lampo dell'armi). (Chorus: Morà, Cesare morà). Cleopatra, having fallen in love with Cesare, begs the gods to bless him. (Aria: Se pietà di me non senti). In Tolomeo's palace, Tolomeo prepares to enter his harem. (Arioso: Belle dee di questo core). As Tolomeo tries to seduce Cornelia, Sesto rushes in to kill Tolomeo, but is stopped by Achilla. Achilla announces that Cesare (in the attempt to run from soldiers) has jumped from the palace window and died. Achilla asks again for Cornelia's hand in marriage but is turned down by Tolomeo. Furious, Achilla leaves. Sesto feels devastated and attempts to kill himself but is prevented from doing so by his mother; he repeats his vow to kill Tolomeo. (Aria: L'aure che spira).
Act 3
Furious at Tolomeo for being ungrateful to him despite his loyalty, Achilla plans to defect to Cleopatra's side (Aria: Dal fulgor di questa spada), but Tolomeo stabs him before he does. As battle rings out between Tolomeo's and Cleopatra's armies, Tolomeo celebrates his apparent victory against Cleopatra (Aria: Domerò la tua fierezza). Cleopatra laments losing both the battle and Cesare (Aria: Piangerò la sorte mia). However, Cesare is not dead: he survived his leap and is roaming the desert in search of his troops (Aria: Aure, deh, per pietà). While looking for Tolomeo, Sesto finds the wounded, nearly dead Achilla, who hands Sesto a seal authorizing him to command his armies. Cesare appears and demands the seal, promising that he will either save both Cornelia and Cleopatra or die (Aria: Quel torrente, che cade dal monte). With Cesare alive and Achilla dead, Sesto's spirits lift, and he vows to fight on (Aria: La giustizia ha già sull'arco). Cesare continues on to Cleopatra's camp, where a lamenting Cleopatra is overjoyed to see him. (Aria: Da tempeste il legno infranto).
In the palace, Sesto finds Tolomeo trying to rape Cornelia and kills him. Having successfully avenged Pompeo, Cornelia and Sesto celebrate Tolomeo's death. (Aria: Non ha più che temere). The victorious Cesare and Cleopatra enter Alexandria, and Cesare proclaims Cleopatra to be queen of Egypt and promises his support to her and her country. They declare their love for each other (Duet: Caro! Bella! Più amabile beltà). Cesare then proclaims Egypt's liberation from tyranny, and wishes for the glory of Rome to spread far and wide. For the final chorus, the entire cast (including the dead Achilla and Tolomeo) gathers on stage to celebrate the power of love and the triumph of good over evil (Chorus: Ritorni omai nel nostro core).