Christina got her big break in 1998, when she was chosen to sing "Reflection," the theme song from "Mulan." "My manager gives me a random phone call out of the clear blue one day," Christina told Entertainment Weekly in 1999. "He's like, 'Can you belt the high E above middle C?' And now this is known as the note that changed my life, because basically I had to prove that I could belt this note -- like, full-on belt it -- by FedExing out, overnight, a karaoke tape of [singing over] Whitney Houston's 'I Want to Run to You,' which has that note, just like 'Reflection.'" Christina got the gig, and shortly after recording the song, she was signed to RCA Records.