Single mom says she's nervous about country week: 'I'm gonna do it, though. I'll tear it up!'By Katie Byrne Kai Kalama and Megan Joy Corkrey perform on "American Idol" Photo: Frank Micelotta/Getty Images for Fox Megan Joy Corkrey is not your typical "American Idol" contestant. She doesn't tackle big ballads or try to outsing Mariah, but she stands out in a crowd. And that's why the judges selected her (along with Anoop Desai, Matt Giraud and Jasmine Murray) for the finals during Thursday night's wild-card round.