There is a melody of Carmen overture in the matador's song? Why?

Because Carmen's opera has a story about bullfighting. [Editor] Act I There is a bridge in a beautiful square in Seville. There is a cigarette factory on the left side of the guard room. Michelle pulled to find Don Jose, but she couldn't find him. She was also harassed by naughty soldiers, so she had to go first and then come back. Jose took Moraret's place, and his superior officer was Sergeant zuniga. The women workers in the tobacco factory rushed out of the factory during the break, when Carmen appeared and all the men came here to woo her, except Jose. But Carmen likes him. Habanella: "Love is a bird." Michella, who loves Jose, brought messages and greetings from his mother (Don Jose: "Tell me about my mother"). After she left, there was a fight in the tobacco factory. zuniga caught Carmen, who was threatening her workmates with a knife. She was taken care of by Jose, who could not resist the temptation and let her go. (Segidra: The Wall of Seville. ) [Editor] In the night of the smuggler's hotel, gypsy woman was singing and dancing (Carmen, Fasques, Mercedes: The Rattling Tambourines). ) The matador Escamino arrived and was welcomed by the hot train. They sang "Fight, matador". Dan Cairo, Remunda, Carmen, Fasques Da and Mercedes decided to form a smuggling ring. But Carmen refused to join because she was waiting for Jose. Jose went to prison for her. After she got out of prison, Jose went to the local area, but at this time the phone rang and Carmen stopped his report. Canzonetta: "Stop, who's there." ) zuniga suddenly appeared, Jose drew his sword angrily. But the sergeant was quickly disarmed by smugglers, and Jose had to join Carmen. (Errenzhuan, Carmen, Don Jose: "I will dance for your honor." [Editor] In the third act, in a valley, Jose acts with smugglers (sextet and chorus: "Listen, comrades"), but Carmen doesn't love him anymore. She has fallen in love with Escano now. (Poker trio: "Shuffle, shuffle, cut, cut." Smugglers stopped the duel between Jose and Escamino (duet: "I am Escamino." Michella came (aria: "This is a smuggler's stronghold") and told Jose that his mother was going to die soon. Jose viciously threatened Carmen and left the brigade. [Editor] In the fourth act, in the square in front of the bullring in Seville, the matadors crowded out. Carmen agreed to Escamino's proposal on condition that he could come back successfully. When she was about to enter the arena, she met a pale Jose. (Duet, Carmen, Don Jose: "It's you; Jose pursued Carmen for the last time, but Carmen refused. So Jose inserted the dagger into Carmen's chest. When the victorious Escano returned to the square, Carmen was already dead. Finally, Jose surrendered to the soldiers, and the tragedy of this triangle relationship ended. Reference: Opera Guide by Leo Meritz, 192 1 Edition.