Generate a question about the following movie plot: Manuela Alva (Judy Garland), who lives in the small Caribbean village of Calvados, dreams of being swept away by the legendary Pirate, Mack "the Black" Macoco. However, her aunt and uncle (who have raised her) insist that she marry the town mayor, the rotund and bullying Don Pedro (Walter Slezak). Shortly before her wedding, Manuela visits a nearby town, Port Sebastian. A traveling circus has arrived, and Serafin (Gene Kelly), its handsome leader, flirts with all the girls in the song "Nina." When he encounters Manuela, however, he falls in love with her at first sight. Serafin compliments Manuela's beauty and begs her not to marry Don Pedro, but, angered, she hurries away. That night, however, Manuela cannot sleep, and she sneaks out to go see Serafin's show. At the show, Serafin hypnotizes Manuela, thinking that she will admit she loves him. Instead, the hypnotized girl wildly sings and dances about her love for "Mack the Black." Serafin awakens Manuela with a kiss, and she flees in horror. On Manuela's wedding day, the traveling players arrive in Calvados. Serafin begs Manuela to join his troupe, and asks her to admit that she loves him. Don Pedro, hearing noise in Manuela's room, arrives at her door, and asks Manuela to go away so that he can teach Serafin a lesson. Serafin recognizes Don Pedro as Macoco, retired and obese. He blackmails Pedro with this information, swearing to tell it to Manuela if Don Pedro forbids the performers from putting on a show. Serafin then decides to pretend to be Macoco in order to win over Manuela. He reveals himself before the whole town as Macoco, then asks Manuela if she will come with him; she again refuses. Still, watching from her window as "Macoco" dances, she begins to daydream about the pirate. The next day, "Macoco" threatens to burn down the town if he cannot have Manuela. Finally, she happily agrees to go with him. One of Serafin's troupe accidentally reveals Serafin's plan to Manuela. To get her revenge, she first pretends to seduce Serafin, then attacks him...
A:
What song do Manuela and Seraphin perform together in the final scene??