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
Britney Spears with the latter two focused on giving families from various disadvantaged situations new hope and stable foundations for the future. On October 24, 2015, Spears donated $120,000 to the Nevada Childhood Cancer Foundation. In addition, $1 of each ticket sale for her Las Vegas residency, "Britney: Piece of Me", was donated to the nonprofit organization. Spears also fundraised for the charity through social media, in addition to selling limited edition merchandise, with all proceeds going to the NCCF. On October 27, 2016, Spears partnered with Zappos and XCYCLE to host the "Britney Spears Piece of Me Charity Ride" in Boca