Circus (Britney Spears album) "Circus" marked the longest time she had spent recording an album, adding, "I think it is more urban [...] I'm writing every day, right here at the piano in this living room" and also described the album as her best work to date. Producer Claude Kelly discussed the album's initial lack of concept saying, "When I went in with [Dr. Luke] we knew we were going to maybe write something for [Britney], but there was no concept, it was just knowing her style and knowing what she does. Max Martin, who produced Spears' debut single "...Baby One More Time", produced
Perfume (Britney Spears song) cut version of the video, where Spears' role in the video is actually an assassin hired to kill her boyfriend. Spears included the song on her residency concert (2013–16). The song has sold over 300,000 copies in the United States. In July 2013, Spears revealed through Twitter that she "wrote such a special song" with Australian singer-songwriter Sia Furler, which was later revealed to be Spears' favorite track on "Britney Jean", the ballad "Perfume". In October 2013, it was announced that the song would serve as the second single for the album, after the release of lead single "Work Bitch"