"Radar" is a song by American singer Britney Spears from her fifth studio album, Blackout (2007). It was written and produced by Bloodshy & Avant and the Clutch, with additional writing from Henrik Jonback. The recording sessions took place the day after Spears filed for divorce from Kevin Federline, and members of the Clutch claimed to be surprised by her work ethic. "Radar" was originally planned to be released as the third single from Blackout, but "Break the Ice" was chosen instead. The song was then planned as the fourth single, but the release was cancelled as Spears began recording her sixth studio album, Circus (2008). "Radar" was later included as a bonus track on Circus, and released as the fourth and final single from the album on June 22, 2009, by Jive Records.

"If U Seek Amy" is a song by American singer Britney Spears from her sixth studio album, Circus (2008). It was released on March 10, 2009, by Jive Records as the third single of the album, chosen by a poll on Spears's official website. "If U Seek Amy" was written and produced by Swedish producer Max Martin, who also wrote previous hits for her first three albums. In the song, Spears is looking for a woman named Amy in a club, and although it appears to be about sex, it is actually about how society perceives her life. Musically, "If U Seek Amy" makes use of instruments such as keyboards and timpani.