"Roar" is a song by American singer Katy Perry for her fourth studio album, Prism (2013). It was released as the lead single from the record on August 10, 2013. The song was written by Perry, Bonnie McKee, Dr. Luke, Max Martin, and Cirkut, and produced by the latter three. It is a power pop song, containing elements of glam rock and arena rock, with lyrics centering on standing up for oneself and self-empowerment.