"Circus" is a song by American singer Britney Spears. It was released on December 2, 2008, through Jive Records as the second single from her sixth studio album of the same name. Written by Dr. Luke, Claude Kelly and Benny Blanco, "Circus" is a metaphor for the public's perception of Spears' life. After she listened to the track for the first time, she felt inspired to create an album and a tour with a circus theme. "Circus" is an uptempo electropop and dance-pop song with elements of pop rock and "half-rapped" vocals. The song's lyrics talk about being an entertainer and putting on shows.