“Till the World Ends” is a song by American recording artist Britney Spears. It was released as the second single from her seventh studio album, Femme Fatale. “Till the World Ends” was written by Dr. Luke, Alexander Kronlund, Max Martin and Kesha, while being produced by Dr. Luke, Max Martin and Billboard. The main inspiration of the song for Kesha was imagining Spears and any other female musician touring the world. “Till the World Ends” was leaked on March 3, 2011, and was released for digital download the following day. The song is composed as an uptempo dance-pop and electropop song with a chant-like chorus, where Spears sings about dancing until the end of the world.
“Till the World Ends” received mostly positive reviews, with critics calling it a catchy dance track and complimenting its anthemic hook. The song has charted in many countries worldwide, while peaking inside the top ten in nations such as Canada, Finland, Ireland, New Zealand and the United States. The accompanying music video was directed by Ray Kay, and portrays Spears in an underground dance party set on December 21, 2012. Critics noted the similarities with the music video for “I’m a Slave 4 U” (2001), and predominantly gave positive reviews for it. Spears has performed “Till the World Ends” at Rain Nightclub, Good Morning America and Jimmy Kimmel Live!.