episode, she said, can they write me in next week, next week? a few weeks after that, we went to see mama mia in toronto. i'll never forget it. it was that combination of acting and the performance onstage of the singers, and she said, that's what i want to do. i'm going to be a great actress and a singer/song writer. this is what i'm going to do. >> and miley went for it. >> i'm miley cyrus and i'm auditioning for zoey. >> in 2003, against her father's wishes, she auditioned for the role of a lifetime. >> i think you could see the sort of long range plan when you look at her hannah montana audition. you could see she knew exactly what she was doing. >> but producers weren't so sure. when we come back, miley's battle to become hannah montana.