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
Passenger (Britney Spears song) finishing by saying that the track "features Perry's straightforward vocal style (...) while delivering the album's only meaty melody, but its lyrics about living without a map aren't believable coming from Brit's lips. Unlike Madonna or Janet Jackson (or Katy Perry), Spears never seems in control." Credits adapted from the liner notes of Britney Jean. Recording Personnel Passenger (Britney Spears song) "Passenger" is a song recorded by American singer Britney Spears for the eighth studio album "Britney Jean". It was written by Spears, Sia Furler, Katy Perry, Andrew Swanson and Diplo, being produced by the latter, while the vocal production