Lee is the main lyricist and composer in the band, being credited as a songwriter in every song since the release of Fallen. She also maintains solo writing credits for songs such as Lithium and Lost in Paradise. Lee claims that during her years as a high school student, she would listen to music that was not necessarily popular at the time. Her lyrics are often associated to themes ranging from hopelessness, introspection and loss to self-respect and empowerment.