"Me Against the Music" is a song by American singers Britney Spears and Madonna for Spears' fourth studio album, In the Zone (2003). It was written by Spears, Madonna, Christopher "Tricky" Stewart, Thabiso "Tab" Nikhereanye, Penelope Magnet, Terius Nash and Gary O'Brien. The song was released on October 14, 2003, by Jive Records, as the lead single of In the Zone. After bonding with Spears during a night in New York City, Stewart and Magnet started working on the song for her. During rehearsals for the 2003 MTV Video Music Awards, Spears played Madonna the track and asked her to do the song with her.

The Circus Starring Britney Spears, commonly referred to as the Circus Tour, was the seventh concert tour by American entertainer Britney Spears. It was launched in support of her sixth studio album, Circus (2008). Rumors of a tour arose as early as October 2007, however, nothing was confirmed until December 2008, when the tour was officially announced, with North American and European dates revealed. The stage was composed of three rings and set in-the-round to resemble an actual circus. Fashion designers Dean and Dan Caten created the costumes. A giant cylinder screen was set above the stage to showcase videos and backdrops. Effects were provided by Solotech. Magician Ed Alonzo joined Spears during the second act. The setlist was composed generally from her albums In the Zone, Blackout and Circus. Spears announced she would tour Australia for the first time in June 2009.