"Till the World Ends" is a song recorded by American singer Britney Spears for her seventh studio album, Femme Fatale (2011). It was written by Kesha Sebert, Lukasz "Dr. Luke" Gottwald, Alexander Kronlund, and Max Martin. Gottwald, Martin and Billboard produced the song, while vocal production was handled by Emily Wright. "Till the World Ends" is an uptempo dance-pop and electropop song with an electro beat. It opens with sirens, and has elements of trance and Eurodance.