Le monde des musicals

Act I
As the 19th becomes the 20th century, all of New York City is excited because widowed but brassy Dolly Gallagher Levi is in town ("Call On Dolly"). Dolly makes a living through what she calls "meddling" – matchmaking and numerous sidelines, including dance instruction and mandolin lessons ("I Put My Hand In"). She is currently seeking a wife for grumpy Horace Vandergelder, the well-known half-a-millionaire, but it becomes clear that Dolly intends to marry Horace herself. Ambrose Kemper, a young artist, wants to marry Horace's weepy niece Ermengarde, but Horace opposes this because Ambrose's vocation does not guarantee a steady living. Ambrose enlists Dolly's help, and they travel to Yonkers, New York to visit Horace, who is a prominent citizen there and owns Vandergelder's Hay and Feed.

Horace explains to his two clerks, Cornelius Hackl and Barnaby Tucker, that he is going to get married because "It Takes a Woman" to cheerfully do all the household chores. He plans to travel with Dolly to New York City to march in the Fourteenth Street Association Parade and propose to the widow Irene Molloy, who owns a hat shop there. Dolly arrives in Yonkers and "accidentally" mentions that Irene's first husband might not have died of natural causes, and also mentions that she knows an heiress, Ernestina Money, who may be interested in Horace. Horace leaves for New York and tells Cornelius and Barnaby to mind the store.

Cornelius decides that he and Barnaby need to get out of Yonkers. They'll go to New York, have a good meal, spend all their money, see the stuffed whale in Barnum's museum, almost get arrested, and each kiss a girl! They blow up some tomato cans to create a terrible stench and a good alibi to close the store. Dolly mentions that she knows two ladies in New York they should call on: Irene Molloy and her shop assistant, Minnie Fay. She tells Ermengarde and Ambrose that she'll enter them in the polka competition at the upscale Harmonia Gardens Restaurant in New York City so Ambrose can demonstrate his ability to be a bread winner to Uncle Horace. Cornelius, Barnaby, Ambrose, Ermengarde and Dolly "Put on [their] Sunday Clothes" and take the train to New York.

Irene and Minnie open their hat shop for the afternoon. Irene wants a husband but does not love Horace Vandergelder. She declares that she will wear an elaborate hat to impress a gentleman ("Ribbons Down My Back"). Cornelius and Barnaby arrive at the shop and pretend to be rich. Horace and Dolly arrive at the shop, and Cornelius and Barnaby hide. Irene inadvertently mentions that she knows Cornelius Hackl, and Dolly tells her and Horace that even though Cornelius is Horace's clerk by day, he's a New York playboy by night; he's one of the Hackls. Minnie screams when she finds Cornelius hiding in the armoire. Horace is about to open the armoire himself, but Dolly distracts him with patriotic sentiments ("Motherhood March"). Cornelius sneezes, and Horace storms out, realizing there are men hiding in the shop, but not knowing they are his clerks.

Dolly arranges for Cornelius and Barnaby, who are still pretending to be rich, to take the ladies out to dinner to the Harmonia Gardens to make up for their humiliation. She teaches Cornelius and Barnaby how to dance since they always have dancing at such establishments ("Dancing"). Soon, Cornelius, Irene, Barnaby and Minnie are happily dancing. They go to watch the great Fourteenth Street Association Parade together. Alone, Dolly decides to put her dearly departed husband Ephram behind her and to move on with life "Before the Parade Passes By". She asks Ephram's permission to marry Horace, requesting a sign from him. Dolly catches up with the annoyed Vandergelder, who has missed the whole parade, and she convinces him to give her matchmaking one more chance. She tells him that Ernestina Money would be perfect for him and asks him to meet her at the swanky Harmonia Gardens that evening.

Act II
Cornelius is determined to get a kiss before the night is over, but Barnaby isn't so sure. As the clerks have no money for a carriage, they tell the girls that walking to the restaurant shows that they've got "Elegance". At the Harmonia Gardens Restaurant, Rudolph, the head waiter, prepares his service crew for Dolly Levi's return: their usual lightning service, he tells them, must be "twice as lightning" ("The Waiters' Gallop"). Horace arrives with his date, but she proves neither as rich nor as elegant as Dolly had implied; furthermore she is soon bored by Horace and leaves, as Dolly had planned she would.

Cornelius, Barnaby, and their dates arrive, unaware that Horace is also dining at the restaurant. Irene and Minnie, inspired by the restaurant's opulence, order the menu's most expensive items. Cornelius and Barnaby grow increasingly anxious as they discover they have little more than a dollar left. Dolly makes her triumphant return to the Harmonia Gardens and is greeted in style by the staff ("Hello, Dolly!") She sits in the now-empty seat at Horace's table and proceeds to eat a large, expensive dinner, telling the exasperated Horace that no matter what he says, she will not marry him. Barnaby and Horace hail waiters at the same time, and in the ensuing confusion each drops his wallet and inadvertently picks up the other's. Barnaby is delighted that he can now pay the restaurant bill, while Horace finds only a little spare change. Barnaby and Cornelius realize that the wallet must belong to Horace. Cornelius, Irene, Barnaby and Minnie try to sneak out during the "The Polka Contest", but Horace recognizes them and spots Ermengarde and Ambrose as well. The ensuing free-for-all culminates in a trip to night court.

Cornelius and Barnaby confess that they have no money and have never been to New York before. Cornelius declares that even if he has to dig ditches the rest of his life, he'll never forget the day because he had met Irene. Cornelius, Barnaby, and Ambrose then each profess their love for their companion ("It Only Takes A Moment"). Dolly convinces the judge that their only crime was being in love. The judge finds everyone innocent and cleared of all charges, but Horace is declared guilty and forced to pay damages. Dolly mentions marriage again, and Horace declares that he wouldn't marry her if she were the last woman in the world. Dolly angrily bids him "So Long, Dearie", telling him that while he's bored and lonely, she'll be living the high life.

The next morning, back at the hay and feed store, Cornelius and Irene, Barnaby and Minnie, and Ambrose and Ermengarde each set out on new life's paths. A chastened Horace Vandergelder finally admits that he needs Dolly in his life, but Dolly is unsure about the marriage until her late husband sends her a sign. Vandergelder spontaneously repeats a saying of Ephram's: "Money is like manure. It's not worth a thing unless it's spread about, encouraging young things to grow." Horace tells Dolly life would be dull without her, and she promises in return that she'll "never go away again" ("Hello, Dolly" (reprise)).