"The Best of Both Worlds" is a pop-rock song performed by American singer and actress Miley Cyrus for the Disney Channel television series Hannah Montana. Cyrus performs the song as Hannah Montana, who is the alter ego of the series' protagonist Miley Stewart. It was released as the debut and lead single from the Hannah Montana soundtrack album on March 18, 2006. "The Best of Both Worlds" is the theme song of the television series; in the series' third season, the 2009 Movie Mix is used as the theme. A live version is available on Hannah Montana & Miley Cyrus: Best of Both Worlds Concert (2008), a karaoke version is included in the soundtrack's karaoke series (2008), and the 2009 Movie Mix is featured on Hannah Montana: The Movie soundtrack (2009). The song has elements of bubblegum pop and pop rock. Lyrically, it is a showcase of the double life lived by Miley Stewart.