Released on June 22, 2009.
Written by Christian Karlsson, Pontus Winnberg, Henrik Jonback, Balewa Muhammad, Candice Nelson, Ezekiel "Zeke" Lewis and Patrick "J. Que" Smith.
Produced by Bloodshy & Avant and The Clutch.
4th and final single from Circus (2008).
Peaked at #88 on the US Billboard Hot 100 // #46 on the UK Official Charts.
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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.
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Musically, "Radar" is an electropop and synthpop song, that runs through a midtempo dance groove. The song is influenced by rave music and R&B. It has a bouncy and skipping beat, and a repetitive melody reminiscent of a nursery rhyme. Spears' vocals are auto tuned and accompanied by sonar pulses and a heavy usage of distorted synthesizers. The lyrics refer to an attraction between the protagonist and a man, while she wonders if he knows what she is feeling.