The album opens with its lead single "So Yesterday," that according to Duff is an empowering song about breaking up with someone and getting over it. The song, that incorporates elements of pop and rock music, was cited as having influences of Avril Lavigne. The second song on the album, and second single, "Come Clean" documents a relationship between a boy and a girl who feel they are "in the dark" about each other; in Duff's words: "they're coming clean, whether it means they're gonna be together or not." "Little Voice," a cover of the 2000 single "The Little Voice" by Swedish recording artist Sahlene, is the album's third single. The song speaks of having a conversation with ones conscience. "Sweet Sixteen" is a song by Haylie Duff described as being "a really fun song that totally relates to life right now." The album's title track "Metamorphosis" is a song about "getting over a boy." Duff insisted the song was not about fellow singer and ex-boyfriend Aaron Carter, with whom she was rumored to have broken up after a fight. "Inner Strength," another contribution of Haylie Duff, is described by as "very empowering and uplifting" and "really beautiful". The final song on the album, "Why Not," was previously released on the soundtrack for "The Lizzie McGuire Movie", a film in which Duff starred.